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 #define CARP_DFLTTL 255 80 81 /* carp_version */ 82 #define CARP_VERSION 2 83 84 /* carp_type */ 85 #define CARP_ADVERTISEMENT 0x01 86 87 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */ 88 89 /* carp_advbase */ 90 #define CARP_DFLTINTV 1 91 92 /* 93 * Statistics. 94 */ 95 struct carpstats { 96 uint64_t carps_ipackets; /* total input packets, IPv4 */ 97 uint64_t carps_ipackets6; /* total input packets, IPv6 */ 98 uint64_t carps_badif; /* wrong interface */ 99 uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */ 100 uint64_t carps_hdrops; /* packets shorter than hdr */ 101 uint64_t carps_badsum; /* bad checksum */ 102 uint64_t carps_badver; /* bad (incl unsupp) version */ 103 uint64_t carps_badlen; /* data length does not match */ 104 uint64_t carps_badauth; /* bad authentication */ 105 uint64_t carps_badvhid; /* bad VHID */ 106 uint64_t carps_badaddrs; /* bad address list */ 107 108 uint64_t carps_opackets; /* total output packets, IPv4 */ 109 uint64_t carps_opackets6; /* total output packets, IPv6 */ 110 uint64_t carps_onomem; /* no memory for an mbuf */ 111 uint64_t carps_ostates; /* total state updates sent */ 112 113 uint64_t carps_preempt; /* if enabled, preemptions */ 114 }; 115 116 /* 117 * Configuration structure for SIOCSVH SIOCGVH 118 */ 119 struct carpreq { 120 int carpr_state; 121 #define CARP_STATES "INIT", "BACKUP", "MASTER" 122 #define CARP_MAXSTATE 2 123 int carpr_vhid; 124 int carpr_advskew; 125 int carpr_advbase; 126 unsigned char carpr_key[CARP_KEY_LEN]; 127 }; 128 #define SIOCSVH _IOWR('i', 245, struct ifreq) 129 #define SIOCGVH _IOWR('i', 246, struct ifreq) 130 131 /* 132 * Names for CARP sysctl objects 133 */ 134 #define CARPCTL_ALLOW 1 /* accept incoming CARP packets */ 135 #define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */ 136 #define CARPCTL_LOG 3 /* log bad packets */ 137 #define CARPCTL_STATS 4 /* statistics (read-only) */ 138 #define CARPCTL_ARPBALANCE 5 /* balance arp responses */ 139 #define CARPCTL_MAXID 6 140 141 #define CARPCTL_NAMES { \ 142 { 0, 0 }, \ 143 { "allow", CTLTYPE_INT }, \ 144 { "preempt", CTLTYPE_INT }, \ 145 { "log", CTLTYPE_INT }, \ 146 { "stats", CTLTYPE_STRUCT }, \ 147 { "arpbalance", CTLTYPE_INT }, \ 148 } 149 150 #ifdef _KERNEL 151 void carp_carpdev_state(void *); 152 void carp_input (struct mbuf *, int); 153 int carp6_input (struct mbuf **, int *, int); 154 int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *, 155 struct rtentry *); 156 int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *, 157 u_int8_t **); 158 struct ifaddr *carp_iamatch6(void *, struct in6_addr *); 159 void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *); 160 struct ifnet *carp_forus (void *, void *); 161 #endif 162 #endif /* _IP_CARP_H */ 163