Annotation of sys/netinet/ip_carp.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ip_carp.h,v 1.22 2007/03/18 23:23:17 mpf Exp $ */
2:
3: /*
4: * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
5: * Copyright (c) 2003 Ryan McBride. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22: * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25: * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26: * THE POSSIBILITY OF SUCH DAMAGE.
27: */
28:
29: #ifndef _NETINET_IP_CARP_H_
30: #define _NETINET_IP_CARP_H_
31:
32: /*
33: * The CARP header layout is as follows:
34: *
35: * 0 1 2 3
36: * 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
37: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38: * |Version| Type | VirtualHostID | AdvSkew | Auth Len |
39: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40: * | Demotion | AdvBase | Checksum |
41: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42: * | Counter (1) |
43: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44: * | Counter (2) |
45: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
46: * | SHA-1 HMAC (1) |
47: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
48: * | SHA-1 HMAC (2) |
49: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
50: * | SHA-1 HMAC (3) |
51: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
52: * | SHA-1 HMAC (4) |
53: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54: * | SHA-1 HMAC (5) |
55: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
56: *
57: */
58:
59: struct carp_header {
60: #if _BYTE_ORDER == _LITTLE_ENDIAN
61: u_int carp_type:4,
62: carp_version:4;
63: #endif
64: #if _BYTE_ORDER == _BIG_ENDIAN
65: u_int carp_version:4,
66: carp_type:4;
67: #endif
68: u_int8_t carp_vhid; /* virtual host id */
69: u_int8_t carp_advskew; /* advertisement skew */
70: u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */
71: u_int8_t carp_demote; /* demotion indicator */
72: u_int8_t carp_advbase; /* advertisement interval */
73: u_int16_t carp_cksum;
74: u_int32_t carp_counter[2];
75: unsigned char carp_md[20]; /* SHA1 HMAC */
76: } __packed;
77:
78: #define CARP_DFLTTL 255
79:
80: /* carp_version */
81: #define CARP_VERSION 2
82:
83: /* carp_type */
84: #define CARP_ADVERTISEMENT 0x01
85:
86: #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
87:
88: /* carp_advbase */
89: #define CARP_DFLTINTV 1
90:
91: /*
92: * Statistics.
93: */
94: struct carpstats {
95: u_int64_t carps_ipackets; /* total input packets, IPv4 */
96: u_int64_t carps_ipackets6; /* total input packets, IPv6 */
97: u_int64_t carps_badif; /* wrong interface */
98: u_int64_t carps_badttl; /* TTL is not CARP_DFLTTL */
99: u_int64_t carps_hdrops; /* packets shorter than hdr */
100: u_int64_t carps_badsum; /* bad checksum */
101: u_int64_t carps_badver; /* bad (incl unsupp) version */
102: u_int64_t carps_badlen; /* data length does not match */
103: u_int64_t carps_badauth; /* bad authentication */
104: u_int64_t carps_badvhid; /* bad VHID */
105: u_int64_t carps_badaddrs; /* bad address list */
106:
107: u_int64_t carps_opackets; /* total output packets, IPv4 */
108: u_int64_t carps_opackets6; /* total output packets, IPv6 */
109: u_int64_t carps_onomem; /* no memory for an mbuf */
110: u_int64_t carps_ostates; /* total state updates sent */
111:
112: u_int64_t carps_preempt; /* if enabled, preemptions */
113: };
114:
115: #define CARPDEVNAMSIZ 16
116: #ifdef IFNAMSIZ
117: #if CARPDEVNAMSIZ != IFNAMSIZ
118: #error
119: #endif
120: #endif
121:
122: /*
123: * Configuration structure for SIOCSVH SIOCGVH
124: */
125: struct carpreq {
126: int carpr_state;
127: #define CARP_STATES "INIT", "BACKUP", "MASTER"
128: #define CARP_MAXSTATE 2
129:
130: char carpr_carpdev[CARPDEVNAMSIZ];
131: int carpr_vhid;
132: int carpr_advskew;
133: int carpr_advbase;
134: unsigned char carpr_key[CARP_KEY_LEN];
135: };
136:
137: /*
138: * Names for CARP sysctl objects
139: */
140: #define CARPCTL_ALLOW 1 /* accept incoming CARP packets */
141: #define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */
142: #define CARPCTL_LOG 3 /* log bad packets */
143: #define CARPCTL_ARPBALANCE 4 /* balance arp responses */
144: #define CARPCTL_MAXID 5
145:
146: #define CARPCTL_NAMES { \
147: { 0, 0 }, \
148: { "allow", CTLTYPE_INT }, \
149: { "preempt", CTLTYPE_INT }, \
150: { "log", CTLTYPE_INT }, \
151: { "arpbalance", CTLTYPE_INT }, \
152: }
153:
154: #ifdef _KERNEL
155: void carp_ifdetach (struct ifnet *);
156: void carp_proto_input (struct mbuf *, ...);
157: void carp_carpdev_state(void *);
158: void carp_group_demote_adj(struct ifnet *, int);
159: int carp6_proto_input(struct mbuf **, int *, int);
160: int carp_iamatch(struct in_ifaddr *, u_char *,
161: u_int32_t *, u_int32_t);
162: int carp_iamatch6(struct ifnet *, struct ifaddr *);
163: struct ifnet *carp_ourether(void *, struct ether_header *, u_char, int);
164: int carp_input(struct mbuf *, u_int8_t *, u_int8_t *, u_int16_t);
165: int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
166: struct rtentry *);
167: int carp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
168: int carp_lsdrop(struct mbuf *, sa_family_t, u_int32_t *, u_int32_t *);
169: #endif /* _KERNEL */
170: #endif /* _NETINET_IP_CARP_H_ */
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