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
|
/* Copyright (C) 2015-2021 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \ingroup decode
*
* @{
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Decode linktype null:
* http://www.tcpdump.org/linktypes.html
*/
#include "suricata-common.h"
#include "decode.h"
#include "decode-raw.h"
#include "decode-events.h"
#include "util-validate.h"
#include "util-unittest.h"
#include "util-debug.h"
#define HDR_SIZE 4
#define AF_INET6_BSD 24
#define AF_INET6_FREEBSD 28
#define AF_INET6_DARWIN 30
#define AF_INET6_LINUX 10
#define AF_INET6_SOLARIS 26
#define AF_INET6_WINSOCK 23
int DecodeNull(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
const uint8_t *pkt, uint32_t len)
{
DEBUG_VALIDATE_BUG_ON(pkt == NULL);
StatsIncr(tv, dtv->counter_null);
if (unlikely(len < HDR_SIZE)) {
ENGINE_SET_INVALID_EVENT(p, LTNULL_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
if (unlikely(GET_PKT_LEN(p) > HDR_SIZE + USHRT_MAX)) {
return TM_ECODE_FAILED;
}
#if __BYTE_ORDER__ == __BIG_ENDIAN
uint32_t type = pkt[0] | pkt[1] << 8 | pkt[2] << 16 | pkt[3] << 24;
#else
uint32_t type = *((uint32_t *)pkt);
#endif
switch(type) {
case AF_INET:
SCLogDebug("IPV4 Packet");
if (GET_PKT_LEN(p) - HDR_SIZE > USHRT_MAX) {
return TM_ECODE_FAILED;
}
DecodeIPV4(
tv, dtv, p, GET_PKT_DATA(p) + HDR_SIZE, (uint16_t)(GET_PKT_LEN(p) - HDR_SIZE));
break;
case AF_INET6_BSD:
case AF_INET6_FREEBSD:
case AF_INET6_DARWIN:
case AF_INET6_LINUX:
case AF_INET6_SOLARIS:
case AF_INET6_WINSOCK:
SCLogDebug("IPV6 Packet");
if (GET_PKT_LEN(p) - HDR_SIZE > USHRT_MAX) {
return TM_ECODE_FAILED;
}
DecodeIPV6(
tv, dtv, p, GET_PKT_DATA(p) + HDR_SIZE, (uint16_t)(GET_PKT_LEN(p) - HDR_SIZE));
break;
default:
SCLogDebug("Unknown Null packet type version %" PRIu32 "", type);
ENGINE_SET_EVENT(p, LTNULL_UNSUPPORTED_TYPE);
break;
}
return TM_ECODE_OK;
}
/**
* @}
*/
|
