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carp: add carp_group_demote_adj()
[dragonfly.git] / sys / netinet / ip_carp.h
CommitLineData
0d16ba1d
MD		 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
99dd49c5
SW		 36#include <sys/ioccom.h>
37
0d16ba1d
MD		 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
65struct carp_header {
66#if BYTE_ORDER == LITTLE_ENDIAN
ab398e4b 67 uint8_t carp_type:4,
0d16ba1d
MD		 68 carp_version:4;
69#endif
70#if BYTE_ORDER == BIG_ENDIAN
ab398e4b 71 uint8_t carp_version:4,
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MD		 72 carp_type:4;
73#endif
ab398e4b
SZ		 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];
0d16ba1d
MD		 81 unsigned char carp_md[20]; /* SHA1 HMAC */
82} __packed;
83
84#ifdef CTASSERT
85CTASSERT(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 */
104struct 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 */
128struct 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};
5bd4422e
SZ		 137#define SIOCSVH _IOWR('i', 245, struct ifreq)
138#define SIOCGVH _IOWR('i', 246, struct ifreq)
139
140
141struct 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 */
0d16ba1d
MD		 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
172void carp_carpdev_state(void *);
2dc67ae2 173void carp_group_demote_adj(struct ifnet *, int);
b5619bf8
SZ		 174void carp_input(struct mbuf *, ...);
175int carp6_input(struct mbuf **, int *, int);
176int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
0d16ba1d 177 struct rtentry *);
5bd4422e
SZ		 178int carp_iamatch(const void *, const struct in_addr *,
179 const struct in_addr *, uint8_t **);
0d16ba1d
MD		 180struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
181void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
5bd4422e 182int carp_forus(const void *, const void *);
ab398e4b
SZ		 183#endif /* _KERNEL */
184
0d16ba1d 185#endif /* _IP_CARP_H */
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