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
|
/*
* Copyright (c) 2000 William C. Fenner.
* All rights reserved.
*
* Kevin Steves <ks@hp.se> July 2000
* Modified to:
* - print version, type string and packet length
* - print IP address count if > 1 (-v)
* - verify checksum (-v)
* - print authentication string (-v)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* The name of William C. Fenner may not be used to endorse or
* promote products derived from this software without specific prior
* written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*/
/* \summary: Virtual Router Redundancy Protocol (VRRP) printer */
#include <config.h>
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "extract.h"
#include "addrtoname.h"
#include "ip.h"
#include "ipproto.h"
/*
* RFC 2338 (VRRP v2):
*
* 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 | Virtual Rtr ID| Priority | Count IP Addrs|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Auth Type | Adver Int | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | IP Address (1) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | . |
* | . |
* | . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | IP Address (n) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Authentication Data (1) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Authentication Data (2) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*
* RFC 5798 (VRRP v3):
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | IPv4 Fields or IPv6 Fields |
* ... ...
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Version| Type | Virtual Rtr ID| Priority |Count IPvX Addr|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |(rsvd) | Max Adver Int | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | IPvX Address(es) |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* Type */
#define VRRP_TYPE_ADVERTISEMENT 1
static const struct tok type2str[] = {
{ VRRP_TYPE_ADVERTISEMENT, "Advertisement" },
{ 0, NULL }
};
/* Auth Type */
#define VRRP_AUTH_NONE 0
#define VRRP_AUTH_SIMPLE 1
#define VRRP_AUTH_AH 2
static const struct tok auth2str[] = {
{ VRRP_AUTH_NONE, "none" },
{ VRRP_AUTH_SIMPLE, "simple" },
{ VRRP_AUTH_AH, "ah" },
{ 0, NULL }
};
void
vrrp_print(netdissect_options *ndo,
const u_char *bp, u_int len,
const u_char *bp2, int ttl,
int ver)
{
int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */
const char *type_s;
ndo->ndo_protocol = "vrrp";
nd_print_protocol_caps(ndo);
version = (GET_U_1(bp) & 0xf0) >> 4;
type = GET_U_1(bp) & 0x0f;
type_s = tok2str(type2str, "unknown type (%u)", type);
ND_PRINT("v%u, %s", version, type_s);
if (ttl != 255)
ND_PRINT(", (ttl %u)", ttl);
if (version < 2 || version > 3 || type != VRRP_TYPE_ADVERTISEMENT)
return;
ND_PRINT(", vrid %u, prio %u", GET_U_1(bp + 1), GET_U_1(bp + 2));
if (version == 2) {
auth_type = GET_U_1(bp + 4);
ND_PRINT(", authtype %s", tok2str(auth2str, NULL, auth_type));
ND_PRINT(", intvl %us, length %u", GET_U_1(bp + 5), len);
} else { /* version == 3 */
uint16_t intvl = (GET_U_1(bp + 4) & 0x0f) << 8 | GET_U_1(bp + 5);
ND_PRINT(", intvl %ucs, length %u", intvl, len);
}
if (ndo->ndo_vflag) {
u_int naddrs = GET_U_1(bp + 3);
u_int i;
char c;
if (version == 2 && ND_TTEST_LEN(bp, len)) {
struct cksum_vec vec[1];
vec[0].ptr = bp;
vec[0].len = len;
if (in_cksum(vec, 1))
ND_PRINT(", (bad vrrp cksum %x)",
GET_BE_U_2(bp + 6));
}
if (version == 3 && ND_TTEST_LEN(bp, len)) {
uint16_t cksum;
if (ver == 4)
cksum = nextproto4_cksum(ndo, (const struct ip *)bp2, bp,
len, len, IPPROTO_VRRP);
else
cksum = nextproto6_cksum(ndo, (const struct ip6_hdr *)bp2, bp,
len, len, IPPROTO_VRRP);
if (cksum)
ND_PRINT(", (bad vrrp cksum %x)",
GET_BE_U_2(bp + 6));
}
ND_PRINT(", addrs");
if (naddrs > 1)
ND_PRINT("(%u)", naddrs);
ND_PRINT(":");
c = ' ';
bp += 8;
for (i = 0; i < naddrs; i++) {
if (ver == 4) {
ND_PRINT("%c%s", c, GET_IPADDR_STRING(bp));
bp += 4;
} else {
ND_PRINT("%c%s", c, GET_IP6ADDR_STRING(bp));
bp += 16;
}
c = ',';
}
if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
ND_PRINT(" auth \"");
/*
* RFC 2338 Section 5.3.10: "If the configured authentication string
* is shorter than 8 bytes, the remaining space MUST be zero-filled.
*/
nd_printjnp(ndo, bp, 8);
ND_PRINT("\"");
}
}
}
|
