/* $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_ */
