FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.h
1 /* $FreeBSD: src/sys/netinet/ip_carp.h,v 1.3 2006/12/01 18:37:41 imp Exp $ */
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_state;
125 #define CARP_STATES "INIT", "BACKUP", "MASTER"
126 #define CARP_MAXSTATE 2
127 int carpr_vhid;
128 int carpr_advskew;
129 int carpr_advbase;
130 unsigned char carpr_key[CARP_KEY_LEN];
131 };
132 #define SIOCSVH _IOWR('i', 245, struct ifreq)
133 #define SIOCGVH _IOWR('i', 246, struct ifreq)
134
135 /*
136 * Names for CARP sysctl objects
137 */
138 #define CARPCTL_ALLOW 1 /* accept incoming CARP packets */
139 #define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */
140 #define CARPCTL_LOG 3 /* log bad packets */
141 #define CARPCTL_STATS 4 /* statistics (read-only) */
142 #define CARPCTL_ARPBALANCE 5 /* balance arp responses */
143 #define CARPCTL_MAXID 6
144
145 #define CARPCTL_NAMES { \
146 { 0, 0 }, \
147 { "allow", CTLTYPE_INT }, \
148 { "preempt", CTLTYPE_INT }, \
149 { "log", CTLTYPE_INT }, \
150 { "stats", CTLTYPE_STRUCT }, \
151 { "arpbalance", CTLTYPE_INT }, \
152 }
153
154 #ifdef _KERNEL
155 void carp_carpdev_state(void *);
156 void carp_input (struct mbuf *, int);
157 int carp6_input (struct mbuf **, int *, int);
158 int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
159 struct rtentry *);
160 int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *,
161 u_int8_t **);
162 struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
163 void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
164 struct ifnet *carp_forus (void *, void *);
165 #endif
166 #endif /* _IP_CARP_H */
167
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