HAMMER 60I/Many: Mirroring
[dragonfly.git] / sys / netinet / ip_carp.h
blob6815904ee5b72189b81ff7ed5050b73068eb0636
1 /*
2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
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.
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.
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 $
33 #ifndef _IP_CARP_H
34 #define _IP_CARP_H
37 * The CARP header layout is as follows:
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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;
82 #ifdef CTASSERT
83 CTASSERT(sizeof(struct carp_header) == 36);
84 #endif
86 #define CARP_DFLTTL 255
88 /* carp_version */
89 #define CARP_VERSION 2
91 /* carp_type */
92 #define CARP_ADVERTISEMENT 0x01
94 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
96 /* carp_advbase */
97 #define CARP_DFLTINTV 1
100 * Statistics.
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 */
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 */
120 uint64_t carps_preempt; /* if enabled, preemptions */
124 * Configuration structure for SIOCSVH SIOCGVH
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];
135 #define SIOCSVH _IOWR('i', 245, struct ifreq)
136 #define SIOCGVH _IOWR('i', 246, struct ifreq)
139 * Names for CARP sysctl objects
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
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 }, \
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 */