Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.h
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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 #include <sys/ioccom.h> 37 38 /* 39 * The CARP header layout is as follows: 40 * 41 * 0 1 2 3 42 * 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 43 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 44 * |Version| Type | VirtualHostID | AdvSkew | Auth Len | 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * | Reserved | AdvBase | Checksum | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 * | Counter (1) | 49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 * | Counter (2) | 51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 * | SHA-1 HMAC (1) | 53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 * | SHA-1 HMAC (2) | 55 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 56 * | SHA-1 HMAC (3) | 57 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 58 * | SHA-1 HMAC (4) | 59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 60 * | SHA-1 HMAC (5) | 61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 62 * 63 */ 64 65 struct carp_header { 66 #if BYTE_ORDER == LITTLE_ENDIAN 67 uint8_t carp_type:4, 68 carp_version:4; 69 #endif 70 #if BYTE_ORDER == BIG_ENDIAN 71 uint8_t carp_version:4, 72 carp_type:4; 73 #endif 74 uint8_t carp_vhid; /* virtual host id */ 75 uint8_t carp_advskew; /* advertisement skew */ 76 uint8_t carp_authlen; /* size of counter+md, 32bit chunks */ 77 uint8_t carp_pad1; /* reserved */ 78 uint8_t carp_advbase; /* advertisement interval */ 79 uint16_t carp_cksum; 80 uint32_t carp_counter[2]; 81 unsigned char carp_md[20]; /* SHA1 HMAC */ 82 } __packed; 83 84 #ifdef CTASSERT 85 CTASSERT(sizeof(struct carp_header) == 36); 86 #endif 87 88 #define CARP_DFLTTL 255 89 90 /* carp_version */ 91 #define CARP_VERSION 2 92 93 /* carp_type */ 94 #define CARP_ADVERTISEMENT 0x01 95 96 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */ 97 98 /* carp_advbase */ 99 #define CARP_DFLTINTV 1 100 101 /* 102 * Statistics. 103 */ 104 struct carpstats { 105 uint64_t carps_ipackets; /* total input packets, IPv4 */ 106 uint64_t carps_ipackets6; /* total input packets, IPv6 */ 107 uint64_t carps_badif; /* wrong interface */ 108 uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */ 109 uint64_t carps_hdrops; /* packets shorter than hdr */ 110 uint64_t carps_badsum; /* bad checksum */ 111 uint64_t carps_badver; /* bad (incl unsupp) version */ 112 uint64_t carps_badlen; /* data length does not match */ 113 uint64_t carps_badauth; /* bad authentication */ 114 uint64_t carps_badvhid; /* bad VHID */ 115 uint64_t carps_badaddrs; /* bad address list */ 116 117 uint64_t carps_opackets; /* total output packets, IPv4 */ 118 uint64_t carps_opackets6; /* total output packets, IPv6 */ 119 uint64_t carps_onomem; /* no memory for an mbuf */ 120 uint64_t carps_ostates; /* total state updates sent */ 121 122 uint64_t carps_preempt; /* if enabled, preemptions */ 123 }; 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 struct ifcarpvhaddr { 142 uint32_t carpa_flags; /* CARP_VHAF_ */ 143 struct sockaddr_in carpa_addr; /* carp address */ 144 struct sockaddr_in carpa_baddr; /* backing address */ 145 }; 146 #define CARP_VHAF_OWNER 0x1 147 #define CARP_VHAF_ONLIST 0x2 148 149 #define CARPGDEVNAME 0 /* SIOCGDRVSPEC char[IFNAMSIZ] */ 150 #define CARPGVHADDR 1 /* SIOCGDRVSPEC ifcarpvhaddr array */ 151 152 /* 153 * Names for CARP sysctl objects 154 */ 155 #define CARPCTL_ALLOW 1 /* accept incoming CARP packets */ 156 #define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */ 157 #define CARPCTL_LOG 3 /* log bad packets */ 158 #define CARPCTL_STATS 4 /* statistics (read-only) */ 159 #define CARPCTL_ARPBALANCE 5 /* balance arp responses */ 160 #define CARPCTL_MAXID 6 161 162 #define CARPCTL_NAMES { \ 163 { 0, 0 }, \ 164 { "allow", CTLTYPE_INT }, \ 165 { "preempt", CTLTYPE_INT }, \ 166 { "log", CTLTYPE_INT }, \ 167 { "stats", CTLTYPE_STRUCT }, \ 168 { "arpbalance", CTLTYPE_INT }, \ 169 } 170 171 #ifdef _KERNEL 172 void carp_group_demote_adj(struct ifnet *, int); 173 int carp_proto_input(struct mbuf **, int *, int); 174 int carp6_proto_input(struct mbuf **, int *, int); 175 void carp_proto_ctlinput(netmsg_t); 176 int carp_iamatch(const struct in_ifaddr *); 177 struct ifaddr *carp_iamatch6(void *, struct in6_addr *); 178 void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *); 179 struct mbuf *carp_input(void *, struct mbuf *); 180 struct ifnet *carp_parent(struct ifnet *); 181 #endif /* _KERNEL */ 182 183 #endif /* _IP_CARP_H */
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