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 /* 121 * Configuration structure for SIOCSVH SIOCGVH 122 */ 123 struct carpreq { 124 int carpr_count; 125 int carpr_vhid; 126 #define CARP_MAXVHID 255 127 int carpr_state; 128 #define CARP_STATES "INIT", "BACKUP", "MASTER" 129 #define CARP_MAXSTATE 2 130 int carpr_advskew; 131 #define CARP_MAXSKEW 240 132 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 #ifdef _KERNEL 139 int carp_ioctl(struct ifreq *, u_long, struct thread *); 140 int carp_attach(struct ifaddr *, int); 141 void carp_detach(struct ifaddr *, bool); 142 void carp_carpdev_state(struct ifnet *); 143 int carp_input(struct mbuf **, int *, int); 144 int carp6_input (struct mbuf **, int *, int); 145 int carp_output (struct ifnet *, struct mbuf *, 146 const struct sockaddr *); 147 int carp_master(struct ifaddr *); 148 int carp_iamatch(struct ifaddr *, uint8_t **); 149 struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *); 150 caddr_t carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *); 151 int carp_forus(struct ifnet *, u_char *); 152 153 /* These are external networking stack hooks for CARP */ 154 /* net/if.c */ 155 extern int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 156 extern int (*carp_attach_p)(struct ifaddr *, int); 157 extern void (*carp_detach_p)(struct ifaddr *, bool); 158 extern void (*carp_linkstate_p)(struct ifnet *); 159 extern void (*carp_demote_adj_p)(int, char *); 160 extern int (*carp_master_p)(struct ifaddr *); 161 /* net/if_bridge.c net/if_ethersubr.c */ 162 extern int (*carp_forus_p)(struct ifnet *, u_char *); 163 /* net/if_ethersubr.c */ 164 extern int (*carp_output_p)(struct ifnet *, struct mbuf *, 165 const struct sockaddr *); 166 /* net/rtsock.c */ 167 extern int (*carp_get_vhid_p)(struct ifaddr *); 168 #ifdef INET 169 /* netinet/if_ether.c */ 170 extern int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 171 #endif 172 #ifdef INET6 173 /* netinet6/nd6_nbr.c */ 174 extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *); 175 extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *, 176 const struct in6_addr *); 177 #endif 178 #endif 179 #endif /* _IP_CARP_H */ 180