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
|
/*
* Copyright (c) 1989, 1990, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may 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: IPv6 Routing Information Protocol (RIPng) printer */
/* specification: RFC 2080 */
#include <config.h>
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
/*
* Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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 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.
*/
#define RIP6_VERSION 1
#define RIP6_REQUEST 1
#define RIP6_RESPONSE 2
struct netinfo6 {
nd_ipv6 rip6_dest;
nd_uint16_t rip6_tag;
nd_uint8_t rip6_plen;
nd_uint8_t rip6_metric;
};
struct rip6 {
nd_uint8_t rip6_cmd;
nd_uint8_t rip6_vers;
nd_byte rip6_res1[2];
struct netinfo6 rip6_nets[1];
};
#define HOPCNT_INFINITY6 16
static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
{
static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */
return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
}
static void
rip6_entry_print(netdissect_options *ndo,
const struct netinfo6 *ni, const u_int print_metric)
{
uint16_t tag;
uint8_t metric;
ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
GET_U_1(ni->rip6_plen));
tag = GET_BE_U_2(ni->rip6_tag);
if (tag)
ND_PRINT(" [%u]", tag);
metric = GET_U_1(ni->rip6_metric);
if (metric && print_metric)
ND_PRINT(" (%u)", metric);
}
void
ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
{
const struct rip6 *rp = (const struct rip6 *)dat;
uint8_t cmd, vers;
const struct netinfo6 *ni;
unsigned int length_left;
u_int j;
ndo->ndo_protocol = "ripng";
vers = GET_U_1(rp->rip6_vers);
if (vers != RIP6_VERSION) {
nd_print_protocol(ndo);
ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION);
goto invalid;
}
cmd = GET_U_1(rp->rip6_cmd);
switch (cmd) {
case RIP6_REQUEST:
length_left = length;
if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
goto invalid;
length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
j = length_left / sizeof(*ni);
if (j == 1) {
if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
&& ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
ND_PRINT(" ripng-req dump");
break;
}
}
if (j * sizeof(*ni) != length_left)
ND_PRINT(" ripng-req %u[%u]:", j, length);
else
ND_PRINT(" ripng-req %u:", j);
for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
length_left -= sizeof(*ni), ++ni) {
if (ndo->ndo_vflag > 1)
ND_PRINT("\n\t");
else
ND_PRINT(" ");
rip6_entry_print(ndo, ni, FALSE);
}
if (length_left != 0)
goto invalid;
break;
case RIP6_RESPONSE:
length_left = length;
if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
goto invalid;
length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
j = length_left / sizeof(*ni);
if (j * sizeof(*ni) != length_left)
ND_PRINT(" ripng-resp %u[%u]:", j, length);
else
ND_PRINT(" ripng-resp %u:", j);
for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
length_left -= sizeof(*ni), ++ni) {
if (ndo->ndo_vflag > 1)
ND_PRINT("\n\t");
else
ND_PRINT(" ");
rip6_entry_print(ndo, ni, TRUE);
}
if (length_left != 0)
goto invalid;
break;
default:
ND_PRINT(" ripng-%u ?? %u", cmd, length);
goto invalid;
}
return;
invalid:
nd_print_invalid(ndo);
}
|
