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hosts to share an IP address, providing high availability and load balancing. Original work on CARP done by Michael Shalayeff, with many additions by Marco Pfatschbacher and Ryan McBride. FreeBSD port done solely by Max Laier. Patch by: mlaier Obtained from: OpenBSD (mickey, mcbride)
164 lines
6.1 KiB
C
164 lines
6.1 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ */
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/*
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* Copyright (c) 2002 Michael Shalayeff. All rights reserved.
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* Copyright (c) 2003 Ryan McBride. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _IP_CARP_H
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#define _IP_CARP_H
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/*
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* The CARP header layout is as follows:
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Version| Type | VirtualHostID | AdvSkew | Auth Len |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved | AdvBase | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Counter (1) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Counter (2) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (1) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (2) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (3) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (4) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (5) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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struct carp_header {
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#if BYTE_ORDER == LITTLE_ENDIAN
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u_int8_t carp_type:4,
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carp_version:4;
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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u_int8_t carp_version:4,
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carp_type:4;
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#endif
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u_int8_t carp_vhid; /* virtual host id */
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u_int8_t carp_advskew; /* advertisement skew */
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u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */
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u_int8_t carp_pad1; /* reserved */
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u_int8_t carp_advbase; /* advertisement interval */
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u_int16_t carp_cksum;
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u_int32_t carp_counter[2];
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unsigned char carp_md[20]; /* SHA1 HMAC */
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} __packed;
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#define CARP_DFLTTL 255
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/* carp_version */
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#define CARP_VERSION 2
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/* carp_type */
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#define CARP_ADVERTISEMENT 0x01
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#define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
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/* carp_advbase */
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#define CARP_DFLTINTV 1
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/*
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* Statistics.
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*/
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struct carpstats {
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uint64_t carps_ipackets; /* total input packets, IPv4 */
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uint64_t carps_ipackets6; /* total input packets, IPv6 */
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uint64_t carps_badif; /* wrong interface */
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uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */
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uint64_t carps_hdrops; /* packets shorter than hdr */
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uint64_t carps_badsum; /* bad checksum */
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uint64_t carps_badver; /* bad (incl unsupp) version */
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uint64_t carps_badlen; /* data length does not match */
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uint64_t carps_badauth; /* bad authentication */
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uint64_t carps_badvhid; /* bad VHID */
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uint64_t carps_badaddrs; /* bad address list */
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uint64_t carps_opackets; /* total output packets, IPv4 */
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uint64_t carps_opackets6; /* total output packets, IPv6 */
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uint64_t carps_onomem; /* no memory for an mbuf */
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uint64_t carps_ostates; /* total state updates sent */
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uint64_t carps_preempt; /* if enabled, preemptions */
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};
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/*
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* Configuration structure for SIOCSVH SIOCGVH
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*/
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struct carpreq {
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int carpr_state;
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#define CARP_STATES "INIT", "BACKUP", "MASTER"
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#define CARP_MAXSTATE 2
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int carpr_vhid;
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int carpr_advskew;
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int carpr_advbase;
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unsigned char carpr_key[CARP_KEY_LEN];
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};
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#define SIOCSVH _IOWR('i', 245, struct ifreq)
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#define SIOCGVH _IOWR('i', 246, struct ifreq)
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/*
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* Names for CARP sysctl objects
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*/
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#define CARPCTL_ALLOW 1 /* accept incoming CARP packets */
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#define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */
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#define CARPCTL_LOG 3 /* log bad packets */
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#define CARPCTL_STATS 4 /* statistics (read-only) */
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#define CARPCTL_ARPBALANCE 5 /* balance arp responses */
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#define CARPCTL_MAXID 6
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#define CARPCTL_NAMES { \
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{ 0, 0 }, \
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{ "allow", CTLTYPE_INT }, \
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{ "preempt", CTLTYPE_INT }, \
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{ "log", CTLTYPE_INT }, \
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{ "stats", CTLTYPE_STRUCT }, \
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{ "arpbalance", CTLTYPE_INT }, \
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}
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#ifdef _KERNEL
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void carp_ifdetach (struct ifnet *);
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void carp_carpdev_state(void *);
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void carp_input (struct mbuf *, int);
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int carp6_input (struct mbuf **, int *, int);
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int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *,
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u_int8_t **);
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struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
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void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
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struct ifnet *carp_forus (void *, void *);
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#endif
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#endif /* _IP_CARP_H */
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