FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.h
1 /* $NetBSD: ip_carp.h,v 1.2 2006/06/13 15:57:15 riz Exp $ */
2 /* $OpenBSD: ip_carp.h,v 1.18 2005/04/20 23:00:41 mpf 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 _NETINET_IP_CARP_H_
31 #define _NETINET_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 #define CARP_DFLTTL 255
80
81 /* carp_version */
82 #define CARP_VERSION 2
83
84 /* carp_type */
85 #define CARP_ADVERTISEMENT 0x01
86
87 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
88
89 /* carp_advbase */
90 #define CARP_DFLTINTV 1
91
92 /*
93 * Statistics.
94 */
95 struct carpstats {
96 u_int64_t carps_ipackets; /* total input packets, IPv4 */
97 u_int64_t carps_ipackets6; /* total input packets, IPv6 */
98 u_int64_t carps_badif; /* wrong interface */
99 u_int64_t carps_badttl; /* TTL is not CARP_DFLTTL */
100 u_int64_t carps_hdrops; /* packets shorter than hdr */
101 u_int64_t carps_badsum; /* bad checksum */
102 u_int64_t carps_badver; /* bad (incl unsupp) version */
103 u_int64_t carps_badlen; /* data length does not match */
104 u_int64_t carps_badauth; /* bad authentication */
105 u_int64_t carps_badvhid; /* bad VHID */
106 u_int64_t carps_badaddrs; /* bad address list */
107
108 u_int64_t carps_opackets; /* total output packets, IPv4 */
109 u_int64_t carps_opackets6; /* total output packets, IPv6 */
110 u_int64_t carps_onomem; /* no memory for an mbuf */
111 u_int64_t carps_ostates; /* total state updates sent */
112
113 u_int64_t carps_preempt; /* if enabled, preemptions */
114 };
115
116 #define CARPDEVNAMSIZ 16
117 #ifdef IFNAMSIZ
118 #if CARPDEVNAMSIZ != IFNAMSIZ
119 #error
120 #endif
121 #endif
122
123 /*
124 * Configuration structure for SIOCSVH SIOCGVH
125 */
126 struct carpreq {
127 int carpr_state;
128 #define CARP_STATES "INIT", "BACKUP", "MASTER"
129 #define CARP_MAXSTATE 2
130
131 char carpr_carpdev[CARPDEVNAMSIZ];
132 int carpr_vhid;
133 int carpr_advskew;
134 int carpr_advbase;
135 unsigned char carpr_key[CARP_KEY_LEN];
136 };
137
138 /*
139 * Names for CARP sysctl objects
140 */
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_ARPBALANCE 4 /* balance arp responses */
145 #define CARPCTL_STATS 5 /* carp statistics */
146 #define CARPCTL_MAXID 6
147
148 #define CARPCTL_NAMES { \
149 { 0, 0 }, \
150 { "allow", CTLTYPE_INT }, \
151 { "preempt", CTLTYPE_INT }, \
152 { "log", CTLTYPE_INT }, \
153 { "arpbalance", CTLTYPE_INT }, \
154 }
155
156 #ifdef _KERNEL
157 void carp_ifdetach (struct ifnet *);
158 void carp_proto_input (struct mbuf *, ...);
159 void carp_carpdev_state(void *);
160 int carp6_proto_input(struct mbuf **, int *, int);
161 int carp_iamatch(struct in_ifaddr *, u_char *,
162 u_int32_t *, u_int32_t);
163 struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
164 struct ifnet *carp_ourether(void *, struct ether_header *, u_char, int);
165 int carp_input(struct mbuf *, u_int8_t *, u_int8_t *, u_int16_t);
166 int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
167 struct rtentry *);
168 #endif /* _KERNEL */
169 #endif /* _NETINET_IP_CARP_H_ */
Cache object: 5d553c635a021ce77e2a59f6594c8bb7
|