/* $FreeBSD$ */
/* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride 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 _IP_CARP_H
#define _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
u_int8_t carp_type:4,
carp_version:4;
#endif
#if BYTE_ORDER == BIG_ENDIAN
u_int8_t 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;
#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.
*/
struct carpstats {
uint64_t carps_ipackets; /* total input packets, IPv4 */
uint64_t carps_ipackets6; /* total input packets, IPv6 */
uint64_t carps_badif; /* wrong interface */
uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */
uint64_t carps_hdrops; /* packets shorter than hdr */
uint64_t carps_badsum; /* bad checksum */
uint64_t carps_badver; /* bad (incl unsupp) version */
uint64_t carps_badlen; /* data length does not match */
uint64_t carps_badauth; /* bad authentication */
uint64_t carps_badvhid; /* bad VHID */
uint64_t carps_badaddrs; /* bad address list */
uint64_t carps_opackets; /* total output packets, IPv4 */
uint64_t carps_opackets6; /* total output packets, IPv6 */
uint64_t carps_onomem; /* no memory for an mbuf */
uint64_t carps_ostates; /* total state updates sent */
uint64_t carps_preempt; /* if enabled, preemptions */
};
#ifdef _KERNEL
#define CARPSTATS_ADD(name, val) carpstats.name += (val)
#define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
#endif
/*
* Configuration structure for SIOCSVH SIOCGVH
*/
struct carpreq {
int carpr_state;
#define CARP_STATES "INIT", "BACKUP", "MASTER"
#define CARP_MAXSTATE 2
int carpr_vhid;
int carpr_advskew;
int carpr_advbase;
unsigned char carpr_key[CARP_KEY_LEN];
};
#define SIOCSVH _IOWR('i', 245, struct ifreq)
#define SIOCGVH _IOWR('i', 246, struct ifreq)
/*
* 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_STATS 4 /* statistics (read-only) */
#define CARPCTL_ARPBALANCE 5 /* balance arp responses */
#define CARPCTL_MAXID 6
#define CARPCTL_NAMES { \
{ 0, 0 }, \
{ "allow", CTLTYPE_INT }, \
{ "preempt", CTLTYPE_INT }, \
{ "log", CTLTYPE_INT }, \
{ "stats", CTLTYPE_STRUCT }, \
{ "arpbalance", CTLTYPE_INT }, \
}
#ifdef _KERNEL
void carp_carpdev_state(struct ifnet *);
void carp_input (struct mbuf *, int);
int carp6_input (struct mbuf **, int *, int);
int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int carp_iamatch (struct ifnet *, struct in_ifaddr *, struct in_addr *,
u_int8_t **);
struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *);
caddr_t carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *);
struct ifnet *carp_forus (struct ifnet *, u_char *);
/* These are external networking stack hooks for CARP */
/* net/if.c */
extern void (*carp_linkstate_p)(struct ifnet *);
/* net/if_bridge.c net/if_ethersubr.c */
extern struct ifnet *(*carp_forus_p)(struct ifnet *, u_char *);
/* net/if_ethersubr.c */
extern int (*carp_output_p)(struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *);
#ifdef INET
/* netinet/if_ether.c */
extern int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *,
struct in_addr *, u_int8_t **);
#endif
#ifdef INET6
/* netinet6/nd6_nbr.c */
extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
const struct in6_addr *);
#endif
#endif
#endif /* _IP_CARP_H */
