1 /* $NetBSD: ip_carp.h,v 1.14 2021/02/03 18:13:13 roy Exp $ */ 2 /* $OpenBSD: ip_carp.h,v 1.18 2005/04/20 23:00:41 mpf Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 6 * Copyright (c) 2003 Ryan McBride. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef _NETINET_IP_CARP_H_ 31 #define _NETINET_IP_CARP_H_ 32 33 /* 34 * The CARP header layout is as follows: 35 * 36 * 0 1 2 3 37 * 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 38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 39 * |Version| Type | VirtualHostID | AdvSkew | Auth Len | 40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 41 * | Reserved | AdvBase | Checksum | 42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 43 * | Counter (1) | 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * | Counter (2) | 46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 47 * | SHA-1 HMAC (1) | 48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 49 * | SHA-1 HMAC (2) | 50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 51 * | SHA-1 HMAC (3) | 52 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 53 * | SHA-1 HMAC (4) | 54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 55 * | SHA-1 HMAC (5) | 56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 57 * 58 */ 59 60 struct carp_header { 61 #if BYTE_ORDER == LITTLE_ENDIAN 62 unsigned int carp_type:4, 63 carp_version:4; 64 #endif 65 #if BYTE_ORDER == BIG_ENDIAN 66 unsigned int carp_version:4, 67 carp_type:4; 68 #endif 69 u_int8_t carp_vhid; /* virtual host id */ 70 u_int8_t carp_advskew; /* advertisement skew */ 71 u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */ 72 u_int8_t carp_pad1; /* reserved */ 73 u_int8_t carp_advbase; /* advertisement interval */ 74 u_int16_t carp_cksum; 75 u_int32_t carp_counter[2]; 76 unsigned char carp_md[20]; /* SHA1 HMAC */ 77 }; 78 79 #ifdef __CTASSERT 80 __CTASSERT(sizeof(struct carp_header) == 36); 81 #endif 82 83 #define CARP_DFLTTL 255 84 85 /* carp_version */ 86 #define CARP_VERSION 2 87 88 /* carp_type */ 89 #define CARP_ADVERTISEMENT 0x01 90 91 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */ 92 93 /* carp_advbase */ 94 #define CARP_DFLTINTV 1 95 96 /* 97 * Statistics. 98 */ 99 #define CARP_STAT_IPACKETS 0 /* total input packets, IPv4 */ 100 #define CARP_STAT_IPACKETS6 1 /* total input packets, IPv6 */ 101 #define CARP_STAT_BADIF 2 /* wrong interface */ 102 #define CARP_STAT_BADTTL 3 /* TTL is not CARP_DFLTTL */ 103 #define CARP_STAT_HDROPS 4 /* packets shorter than hdr */ 104 #define CARP_STAT_BADSUM 5 /* bad checksum */ 105 #define CARP_STAT_BADVER 6 /* bad (incl unsupported) version */ 106 #define CARP_STAT_BADLEN 7 /* data length does not match */ 107 #define CARP_STAT_BADAUTH 8 /* bad authentication */ 108 #define CARP_STAT_BADVHID 9 /* bad VHID */ 109 #define CARP_STAT_BADADDRS 10 /* bad address list */ 110 #define CARP_STAT_OPACKETS 11 /* total output packets, IPv4 */ 111 #define CARP_STAT_OPACKETS6 12 /* total output packets, IPv6 */ 112 #define CARP_STAT_ONOMEM 13 /* no memory for an mbuf */ 113 #define CARP_STAT_OSTATES 14 /* total state updates sent */ 114 #define CARP_STAT_PREEMPT 15 /* in enabled, preemptions */ 115 116 #define CARP_NSTATS 16 117 118 #define CARPDEVNAMSIZ 16 119 #ifdef IFNAMSIZ 120 #if CARPDEVNAMSIZ != IFNAMSIZ 121 #error 122 #endif 123 #endif 124 125 /* 126 * Configuration structure for SIOCSVH SIOCGVH 127 */ 128 struct carpreq { 129 int carpr_state; 130 #define CARP_STATES "INIT", "BACKUP", "MASTER" 131 #define CARP_MAXSTATE 2 132 133 char carpr_carpdev[CARPDEVNAMSIZ]; 134 int carpr_vhid; 135 int carpr_advskew; 136 int carpr_advbase; 137 unsigned char carpr_key[CARP_KEY_LEN]; 138 }; 139 140 /* 141 * Names for CARP sysctl objects 142 */ 143 #define CARPCTL_ALLOW 1 /* accept incoming CARP packets */ 144 #define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */ 145 #define CARPCTL_LOG 3 /* log bad packets */ 146 #define CARPCTL_ARPBALANCE 4 /* balance arp responses */ 147 #define CARPCTL_STATS 5 /* carp statistics */ 148 #define CARPCTL_MAXID 6 149 150 #ifdef _KERNEL 151 void carp_init(void); 152 void carp_ifdetach(struct ifnet *); 153 void carp_proto_input(struct mbuf *, int, int); 154 void carp_carpdev_state(void *); 155 int carp6_proto_input(struct mbuf **, int *, int); 156 int carp_iamatch(struct in_ifaddr *, u_char *, 157 u_int32_t *, u_int32_t); 158 struct ifaddr *carp_iamatch6(void *, struct in6_addr *); 159 struct ifnet *carp_ourether(void *, struct ether_header *, u_char, int); 160 int carp_input(struct mbuf *, u_int8_t *, u_int8_t *, u_int16_t); 161 int carp_output(struct ifnet *, struct mbuf *, 162 const struct sockaddr *, const struct rtentry *); 163 #endif /* _KERNEL */ 164 #endif /* _NETINET_IP_CARP_H_ */ 165