165 lines
6.2 KiB
C
165 lines
6.2 KiB
C
/* $NetBSD: ip_carp.h,v 1.14 2021/02/03 18:13:13 roy Exp $ */
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/* $OpenBSD: ip_carp.h,v 1.18 2005/04/20 23:00:41 mpf 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 _NETINET_IP_CARP_H_
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#define _NETINET_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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unsigned int 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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unsigned int 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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};
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#ifdef __CTASSERT
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__CTASSERT(sizeof(struct carp_header) == 36);
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#endif
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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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#define CARP_STAT_IPACKETS 0 /* total input packets, IPv4 */
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#define CARP_STAT_IPACKETS6 1 /* total input packets, IPv6 */
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#define CARP_STAT_BADIF 2 /* wrong interface */
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#define CARP_STAT_BADTTL 3 /* TTL is not CARP_DFLTTL */
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#define CARP_STAT_HDROPS 4 /* packets shorter than hdr */
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#define CARP_STAT_BADSUM 5 /* bad checksum */
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#define CARP_STAT_BADVER 6 /* bad (incl unsupported) version */
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#define CARP_STAT_BADLEN 7 /* data length does not match */
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#define CARP_STAT_BADAUTH 8 /* bad authentication */
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#define CARP_STAT_BADVHID 9 /* bad VHID */
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#define CARP_STAT_BADADDRS 10 /* bad address list */
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#define CARP_STAT_OPACKETS 11 /* total output packets, IPv4 */
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#define CARP_STAT_OPACKETS6 12 /* total output packets, IPv6 */
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#define CARP_STAT_ONOMEM 13 /* no memory for an mbuf */
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#define CARP_STAT_OSTATES 14 /* total state updates sent */
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#define CARP_STAT_PREEMPT 15 /* in enabled, preemptions */
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#define CARP_NSTATS 16
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#define CARPDEVNAMSIZ 16
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#ifdef IFNAMSIZ
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#if CARPDEVNAMSIZ != IFNAMSIZ
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#error
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#endif
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#endif
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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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char carpr_carpdev[CARPDEVNAMSIZ];
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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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/*
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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_ARPBALANCE 4 /* balance arp responses */
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#define CARPCTL_STATS 5 /* carp statistics */
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#define CARPCTL_MAXID 6
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#ifdef _KERNEL
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void carp_init(void);
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void carp_ifdetach(struct ifnet *);
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void carp_proto_input(struct mbuf *, int, int);
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void carp_carpdev_state(void *);
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int carp6_proto_input(struct mbuf **, int *, int);
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int carp_iamatch(struct in_ifaddr *, u_char *,
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u_int32_t *, u_int32_t);
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struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
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struct ifnet *carp_ourether(void *, struct ether_header *, u_char, int);
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int carp_input(struct mbuf *, u_int8_t *, u_int8_t *, u_int16_t);
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int carp_output(struct ifnet *, struct mbuf *,
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const struct sockaddr *, const struct rtentry *);
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#endif /* _KERNEL */
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#endif /* _NETINET_IP_CARP_H_ */
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