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
|
/*
* Copyright (c) 2013, Petar Alilovic,
* Faculty of Electrical Engineering and Computing, University of Zagreb
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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 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 AUTHOR 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include "netdissect.h"
#if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
#include <pcap/nflog.h>
static const struct tok nflog_values[] = {
{ AF_INET, "IPv4" },
#ifdef INET6
{ AF_INET6, "IPv6" },
#endif /*INET6*/
{ 0, NULL }
};
static inline void
nflog_hdr_print(netdissect_options *ndo, const nflog_hdr_t *hdr, u_int length)
{
ND_PRINT((ndo, "version %d, resource ID %d", hdr->nflog_version, ntohs(hdr->nflog_rid)));
if (!ndo->ndo_qflag) {
ND_PRINT((ndo,", family %s (%d)",
tok2str(nflog_values, "Unknown",
hdr->nflog_family),
hdr->nflog_family));
} else {
ND_PRINT((ndo,", %s",
tok2str(nflog_values,
"Unknown NFLOG (0x%02x)",
hdr->nflog_family)));
}
ND_PRINT((ndo, ", length %u: ", length));
}
u_int
nflog_if_print(netdissect_options *ndo,
const struct pcap_pkthdr *h, const u_char *p)
{
const nflog_hdr_t *hdr = (const nflog_hdr_t *)p;
const nflog_tlv_t *tlv;
uint16_t size;
uint16_t h_size = sizeof(nflog_hdr_t);
u_int caplen = h->caplen;
u_int length = h->len;
if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) {
ND_PRINT((ndo, "[|nflog]"));
return h_size;
}
if (!(hdr->nflog_version) == 0) {
ND_PRINT((ndo, "version %u (unknown)", hdr->nflog_version));
return h_size;
}
if (ndo->ndo_eflag)
nflog_hdr_print(ndo, hdr, length);
p += sizeof(nflog_hdr_t);
length -= sizeof(nflog_hdr_t);
caplen -= sizeof(nflog_hdr_t);
while (length > 0) {
/* We have some data. Do we have enough for the TLV header? */
if (caplen < sizeof(nflog_tlv_t) || length < sizeof(nflog_tlv_t)) {
/* No. */
ND_PRINT((ndo, "[|nflog]"));
return h_size;
}
tlv = (const nflog_tlv_t *) p;
size = tlv->tlv_length;
if (size % 4 != 0)
size += 4 - size % 4;
/* Is the TLV's length less than the minimum? */
if (size < sizeof(nflog_tlv_t)) {
/* Yes. Give up now. */
ND_PRINT((ndo, "[|nflog]"));
return h_size;
}
/* Do we have enough data for the full TLV? */
if (caplen < size || length < size) {
/* No. */
ND_PRINT((ndo, "[|nflog]"));
return h_size;
}
if (tlv->tlv_type == NFULA_PAYLOAD) {
/*
* This TLV's data is the packet payload.
* Skip past the TLV header, and break out
* of the loop so we print the packet data.
*/
p += sizeof(nflog_tlv_t);
h_size += sizeof(nflog_tlv_t);
length -= sizeof(nflog_tlv_t);
caplen -= sizeof(nflog_tlv_t);
break;
}
p += size;
h_size += size;
length -= size;
caplen -= size;
}
switch (hdr->nflog_family) {
case AF_INET:
ip_print(ndo, p, length);
break;
#ifdef AF_INET6
case AF_INET6:
ip6_print(ndo, p, length);
break;
#endif /* AF_INET6 */
default:
if (!ndo->ndo_eflag)
nflog_hdr_print(ndo, hdr,
length + sizeof(nflog_hdr_t));
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
break;
}
return h_size;
}
#endif /* defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H) */
|
