1 /* $FreeBSD$ */ 2 /* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride 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 _IP_CARP_H 31 #define _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 u_int8_t carp_type:4, 63 carp_version:4; 64 #endif 65 #if BYTE_ORDER == BIG_ENDIAN 66 u_int8_t 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 } __packed; 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 struct carpstats { 100 uint64_t carps_ipackets; /* total input packets, IPv4 */ 101 uint64_t carps_ipackets6; /* total input packets, IPv6 */ 102 uint64_t carps_badif; /* wrong interface */ 103 uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */ 104 uint64_t carps_hdrops; /* packets shorter than hdr */ 105 uint64_t carps_badsum; /* bad checksum */ 106 uint64_t carps_badver; /* bad (incl unsupp) version */ 107 uint64_t carps_badlen; /* data length does not match */ 108 uint64_t carps_badauth; /* bad authentication */ 109 uint64_t carps_badvhid; /* bad VHID */ 110 uint64_t carps_badaddrs; /* bad address list */ 111 112 uint64_t carps_opackets; /* total output packets, IPv4 */ 113 uint64_t carps_opackets6; /* total output packets, IPv6 */ 114 uint64_t carps_onomem; /* no memory for an mbuf */ 115 uint64_t carps_ostates; /* total state updates sent */ 116 117 uint64_t carps_preempt; /* if enabled, preemptions */ 118 }; 119 120 #ifdef _KERNEL 121 #define CARPSTATS_ADD(name, val) carpstats.name += (val) 122 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 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 int carpr_vhid; 133 int carpr_advskew; 134 int carpr_advbase; 135 unsigned char carpr_key[CARP_KEY_LEN]; 136 }; 137 #define SIOCSVH _IOWR('i', 245, struct ifreq) 138 #define SIOCGVH _IOWR('i', 246, struct ifreq) 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_STATS 4 /* statistics (read-only) */ 147 #define CARPCTL_ARPBALANCE 5 /* balance arp responses */ 148 #define CARPCTL_MAXID 6 149 150 #define CARPCTL_NAMES { \ 151 { 0, 0 }, \ 152 { "allow", CTLTYPE_INT }, \ 153 { "preempt", CTLTYPE_INT }, \ 154 { "log", CTLTYPE_INT }, \ 155 { "stats", CTLTYPE_STRUCT }, \ 156 { "arpbalance", CTLTYPE_INT }, \ 157 } 158 159 #ifdef _KERNEL 160 void carp_carpdev_state(void *); 161 void carp_input (struct mbuf *, int); 162 int carp6_input (struct mbuf **, int *, int); 163 int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *, 164 struct rtentry *); 165 int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *, 166 u_int8_t **); 167 struct ifaddr *carp_iamatch6(void *, struct in6_addr *); 168 void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *); 169 struct ifnet *carp_forus (void *, void *); 170 #endif 171 #endif /* _IP_CARP_H */ 172