1 /* 2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 3 * Copyright (c) 2003 Ryan McBride. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 24 * THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 /* 27 * $FreeBSD: src/sys/netinet/ip_carp.h,v 1.3 2006/12/01 18:37:41 imp Exp $ 28 * $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ 29 * $DragonFly: src/sys/netinet/ip_carp.h,v 1.1 2007/08/16 20:03:57 dillon Exp $ 30 */ 31 32 33 #ifndef _IP_CARP_H 34 #define _IP_CARP_H 35 36 /* 37 * The CARP header layout is as follows: 38 * 39 * 0 1 2 3 40 * 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 41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 42 * |Version| Type | VirtualHostID | AdvSkew | Auth Len | 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * | Reserved | AdvBase | Checksum | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * | Counter (1) | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 * | Counter (2) | 49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 * | SHA-1 HMAC (1) | 51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 * | SHA-1 HMAC (2) | 53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 * | SHA-1 HMAC (3) | 55 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 56 * | SHA-1 HMAC (4) | 57 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 58 * | SHA-1 HMAC (5) | 59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 60 * 61 */ 62 63 struct carp_header { 64 #if BYTE_ORDER == LITTLE_ENDIAN 65 u_int8_t carp_type:4, 66 carp_version:4; 67 #endif 68 #if BYTE_ORDER == BIG_ENDIAN 69 u_int8_t carp_version:4, 70 carp_type:4; 71 #endif 72 u_int8_t carp_vhid; /* virtual host id */ 73 u_int8_t carp_advskew; /* advertisement skew */ 74 u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */ 75 u_int8_t carp_pad1; /* reserved */ 76 u_int8_t carp_advbase; /* advertisement interval */ 77 u_int16_t carp_cksum; 78 u_int32_t carp_counter[2]; 79 unsigned char carp_md[20]; /* SHA1 HMAC */ 80 } __packed; 81 82 #ifdef CTASSERT 83 CTASSERT(sizeof(struct carp_header) == 36); 84 #endif 85 86 #define CARP_DFLTTL 255 87 88 /* carp_version */ 89 #define CARP_VERSION 2 90 91 /* carp_type */ 92 #define CARP_ADVERTISEMENT 0x01 93 94 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */ 95 96 /* carp_advbase */ 97 #define CARP_DFLTINTV 1 98 99 /* 100 * Statistics. 101 */ 102 struct carpstats { 103 uint64_t carps_ipackets; /* total input packets, IPv4 */ 104 uint64_t carps_ipackets6; /* total input packets, IPv6 */ 105 uint64_t carps_badif; /* wrong interface */ 106 uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */ 107 uint64_t carps_hdrops; /* packets shorter than hdr */ 108 uint64_t carps_badsum; /* bad checksum */ 109 uint64_t carps_badver; /* bad (incl unsupp) version */ 110 uint64_t carps_badlen; /* data length does not match */ 111 uint64_t carps_badauth; /* bad authentication */ 112 uint64_t carps_badvhid; /* bad VHID */ 113 uint64_t carps_badaddrs; /* bad address list */ 114 115 uint64_t carps_opackets; /* total output packets, IPv4 */ 116 uint64_t carps_opackets6; /* total output packets, IPv6 */ 117 uint64_t carps_onomem; /* no memory for an mbuf */ 118 uint64_t carps_ostates; /* total state updates sent */ 119 120 uint64_t carps_preempt; /* if enabled, preemptions */ 121 }; 122 123 /* 124 * Configuration structure for SIOCSVH SIOCGVH 125 */ 126 struct carpreq { 127 int carpr_state; 128 #define CARP_STATES "INIT", "BACKUP", "MASTER" 129 #define CARP_MAXSTATE 2 130 int carpr_vhid; 131 int carpr_advskew; 132 int carpr_advbase; 133 unsigned char carpr_key[CARP_KEY_LEN]; 134 }; 135 #define SIOCSVH _IOWR('i', 245, struct ifreq) 136 #define SIOCGVH _IOWR('i', 246, struct ifreq) 137 138 /* 139 * Names for CARP sysctl objects 140 */ 141 #define CARPCTL_ALLOW 1 /* accept incoming CARP packets */ 142 #define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */ 143 #define CARPCTL_LOG 3 /* log bad packets */ 144 #define CARPCTL_STATS 4 /* statistics (read-only) */ 145 #define CARPCTL_ARPBALANCE 5 /* balance arp responses */ 146 #define CARPCTL_MAXID 6 147 148 #define CARPCTL_NAMES { \ 149 { 0, 0 }, \ 150 { "allow", CTLTYPE_INT }, \ 151 { "preempt", CTLTYPE_INT }, \ 152 { "log", CTLTYPE_INT }, \ 153 { "stats", CTLTYPE_STRUCT }, \ 154 { "arpbalance", CTLTYPE_INT }, \ 155 } 156 157 #ifdef _KERNEL 158 void carp_carpdev_state(void *); 159 void carp_input (struct mbuf *, int); 160 int carp6_input (struct mbuf **, int *, int); 161 int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *, 162 struct rtentry *); 163 int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *, 164 u_int8_t **); 165 struct ifaddr *carp_iamatch6(void *, struct in6_addr *); 166 void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *); 167 struct ifnet *carp_forus (void *, void *); 168 #endif 169 #endif /* _IP_CARP_H */ 170