2 /* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ */
5 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
6 * Copyright (c) 2003 Ryan McBride. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
34 * The CARP header layout is as follows:
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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
52 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
61 #if BYTE_ORDER == LITTLE_ENDIAN
65 #if BYTE_ORDER == BIG_ENDIAN
66 u_int8_t carp_version:4,
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 */
75 u_int32_t carp_counter[2];
76 unsigned char carp_md[20]; /* SHA1 HMAC */
80 CTASSERT(sizeof(struct carp_header) == 36);
83 #define CARP_DFLTTL 255
86 #define CARP_VERSION 2
89 #define CARP_ADVERTISEMENT 0x01
91 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
94 #define CARP_DFLTINTV 1
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 */
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 */
117 uint64_t carps_preempt; /* if enabled, preemptions */
121 #define CARPSTATS_ADD(name, val) carpstats.name += (val)
122 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
126 * Configuration structure for SIOCSVH SIOCGVH
130 #define CARP_STATES "INIT", "BACKUP", "MASTER"
131 #define CARP_MAXSTATE 2
135 unsigned char carpr_key[CARP_KEY_LEN];
137 #define SIOCSVH _IOWR('i', 245, struct ifreq)
138 #define SIOCGVH _IOWR('i', 246, struct ifreq)
141 * Names for CARP sysctl objects
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
150 #define CARPCTL_NAMES { \
152 { "allow", CTLTYPE_INT }, \
153 { "preempt", CTLTYPE_INT }, \
154 { "log", CTLTYPE_INT }, \
155 { "stats", CTLTYPE_STRUCT }, \
156 { "arpbalance", CTLTYPE_INT }, \
160 void carp_carpdev_state(struct ifnet *);
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 *,
165 int carp_iamatch (struct ifnet *, struct in_ifaddr *, struct in_addr *,
167 struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *);
168 caddr_t carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *);
169 struct ifnet *carp_forus (struct ifnet *, u_char *);
171 /* These are external networking stack hooks for CARP */
173 extern void (*carp_linkstate_p)(struct ifnet *);
174 /* net/if_bridge.c net/if_ethersubr.c */
175 extern struct ifnet *(*carp_forus_p)(struct ifnet *, u_char *);
176 /* net/if_ethersubr.c */
177 extern int (*carp_output_p)(struct ifnet *, struct mbuf *,
178 struct sockaddr *, struct rtentry *);
180 /* netinet/if_ether.c */
181 extern int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *,
182 struct in_addr *, u_int8_t **);
185 /* netinet6/nd6_nbr.c */
186 extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
187 extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
188 const struct in6_addr *);
191 #endif /* _IP_CARP_H */