1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/* $OpenBSD: ip_carp.h,v 1.43 2017/05/30 12:09:27 friehm Exp $ */
/*
* Copyright (c) 2002 Michael Shalayeff. All rights reserved.
* Copyright (c) 2003 Ryan McBride. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _NETINET_IP_CARP_H_
#define _NETINET_IP_CARP_H_
/*
* The CARP header layout is as follows:
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Version| Type | VirtualHostID | AdvSkew | Auth Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Demotion | AdvBase | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Counter (1) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Counter (2) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | SHA-1 HMAC (1) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | SHA-1 HMAC (2) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | SHA-1 HMAC (3) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | SHA-1 HMAC (4) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | SHA-1 HMAC (5) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
struct carp_header {
#if _BYTE_ORDER == _LITTLE_ENDIAN
u_int carp_type:4,
carp_version:4;
#endif
#if _BYTE_ORDER == _BIG_ENDIAN
u_int carp_version:4,
carp_type:4;
#endif
u_int8_t carp_vhid; /* virtual host id */
u_int8_t carp_advskew; /* advertisement skew */
u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */
u_int8_t carp_demote; /* demotion indicator */
u_int8_t carp_advbase; /* advertisement interval */
u_int16_t carp_cksum;
u_int32_t carp_counter[2];
unsigned char carp_md[20]; /* SHA1 HMAC */
} __packed;
#define CARP_DFLTTL 255
/* carp_version */
#define CARP_VERSION 2
/* carp_type */
#define CARP_ADVERTISEMENT 0x01
#define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
/* carp_advbase */
#define CARP_DFLTINTV 1
/*
* Statistics.
*/
struct carpstats {
u_int64_t carps_ipackets; /* total input packets, IPv4 */
u_int64_t carps_ipackets6; /* total input packets, IPv6 */
u_int64_t carps_badif; /* wrong interface */
u_int64_t carps_badttl; /* TTL is not CARP_DFLTTL */
u_int64_t carps_hdrops; /* packets shorter than hdr */
u_int64_t carps_badsum; /* bad checksum */
u_int64_t carps_badver; /* bad (incl unsupp) version */
u_int64_t carps_badlen; /* data length does not match */
u_int64_t carps_badauth; /* bad authentication */
u_int64_t carps_badvhid; /* bad VHID */
u_int64_t carps_badaddrs; /* bad address list */
u_int64_t carps_opackets; /* total output packets, IPv4 */
u_int64_t carps_opackets6; /* total output packets, IPv6 */
u_int64_t carps_onomem; /* no memory for an mbuf */
u_int64_t carps_ostates; /* total state updates sent */
u_int64_t carps_preempt; /* transitions to master */
};
#define CARPDEVNAMSIZ 16
#ifdef IFNAMSIZ
#if CARPDEVNAMSIZ != IFNAMSIZ
#error namsiz mismatch
#endif
#endif
/*
* Configuration structure for SIOCSVH SIOCGVH
*/
struct carpreq {
int carpr_state;
#define CARP_STATES "INIT", "BACKUP", "MASTER"
#define CARP_MAXSTATE 2
#define CARP_MAXNODES 32
char carpr_carpdev[CARPDEVNAMSIZ];
u_int8_t carpr_vhids[CARP_MAXNODES];
u_int8_t carpr_advskews[CARP_MAXNODES];
u_int8_t carpr_states[CARP_MAXNODES];
#define CARP_BAL_MODES "none", "ip", "ip-stealth", "ip-unicast"
#define CARP_BAL_NONE 0
#define CARP_BAL_IP 1
#define CARP_BAL_IPSTEALTH 2
#define CARP_BAL_IPUNICAST 3
#define CARP_BAL_MAXID 3
u_int8_t carpr_balancing;
int carpr_advbase;
unsigned char carpr_key[CARP_KEY_LEN];
struct in_addr carpr_peer;
};
/*
* Names for CARP sysctl objects
*/
#define CARPCTL_ALLOW 1 /* accept incoming CARP packets */
#define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */
#define CARPCTL_LOG 3 /* log bad packets */
#define CARPCTL_STATS 4 /* CARP stats */
#define CARPCTL_MAXID 5
#define CARPCTL_NAMES { \
{ 0, 0 }, \
{ "allow", CTLTYPE_INT }, \
{ "preempt", CTLTYPE_INT }, \
{ "log", CTLTYPE_INT }, \
{ "stats", CTLTYPE_STRUCT }, \
}
#ifdef _KERNEL
#include <sys/percpu.h>
enum carpstat_counters {
carps_ipackets,
carps_ipackets6,
carps_badif,
carps_badttl,
carps_hdrops,
carps_badsum,
carps_badver,
carps_badlen,
carps_badauth,
carps_badvhid,
carps_badaddrs,
carps_opackets,
carps_opackets6,
carps_onomem,
carps_ostates,
carps_preempt,
carps_ncounters,
};
extern struct cpumem *carpcounters;
static inline void
carpstat_inc(enum carpstat_counters c)
{
counters_inc(carpcounters, c);
}
void carp_ifdetach (struct ifnet *);
int carp_proto_input(struct mbuf **, int *, int, int);
void carp_carpdev_state(void *);
void carp_group_demote_adj(struct ifnet *, int, char *);
int carp6_proto_input(struct mbuf **, int *, int, int);
int carp_iamatch(struct ifnet *);
int carp_iamatch6(struct ifnet *);
struct ifnet *carp_ourether(void *, u_int8_t *);
int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int carp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
int carp_lsdrop(struct mbuf *, sa_family_t, u_int32_t *,
u_int32_t *, int);
#endif /* _KERNEL */
#endif /* _NETINET_IP_CARP_H_ */
|
