suricata
decode-null.c
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1 /* Copyright (C) 2015-2021 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  * \ingroup decode
20  *
21  * @{
22  */
23 
24 
25 /**
26  * \file
27  *
28  * \author Victor Julien <victor@inliniac.net>
29  *
30  * Decode linkype null:
31  * http://www.tcpdump.org/linktypes.html
32  */
33 
34 #include "suricata-common.h"
35 #include "decode.h"
36 #include "decode-raw.h"
37 #include "decode-events.h"
38 
39 #include "util-validate.h"
40 #include "util-unittest.h"
41 #include "util-debug.h"
42 
43 #include "pkt-var.h"
44 #include "util-profiling.h"
45 #include "host.h"
46 
47 #define HDR_SIZE 4
48 
50  const uint8_t *pkt, uint32_t len)
51 {
52  DEBUG_VALIDATE_BUG_ON(pkt == NULL);
53 
55 
56  if (unlikely(len < HDR_SIZE)) {
58  return TM_ECODE_FAILED;
59  }
60 
61  if (unlikely(GET_PKT_LEN(p) > HDR_SIZE + USHRT_MAX)) {
62  return TM_ECODE_FAILED;
63  }
64 #if __BYTE_ORDER__ == __BIG_ENDIAN
65  uint32_t type = pkt[0] | pkt[1] << 8 | pkt[2] << 16 | pkt[3] << 24;
66 #else
67  uint32_t type = *((uint32_t *)pkt);
68 #endif
69  switch(type) {
70  case AF_INET:
71  SCLogDebug("IPV4 Packet");
73  break;
74  case AF_INET6:
75  SCLogDebug("IPV6 Packet");
77  break;
78  default:
79  SCLogDebug("Unknown Null packet type version %" PRIu32 "", type);
81  break;
82  }
83  return TM_ECODE_OK;
84 }
85 
86 #ifdef UNITTESTS
87 
88 #endif /* UNITTESTS */
89 
90 /**
91  * \brief Registers Null unit tests
92  */
94 {
95 #ifdef UNITTESTS
96 #endif /* UNITTESTS */
97 }
98 /**
99  * @}
100  */
ENGINE_SET_EVENT
#define ENGINE_SET_EVENT(p, e)
Definition: decode.h:1023
host.h
decode-raw.h
len
uint8_t len
Definition: app-layer-dnp3.h:2
StatsIncr
void StatsIncr(ThreadVars *tv, uint16_t id)
Increments the local counter.
Definition: counters.c:169
unlikely
#define unlikely(expr)
Definition: util-optimize.h:35
SCLogDebug
#define SCLogDebug(...)
Definition: util-debug.h:298
HDR_SIZE
#define HDR_SIZE
Definition: decode-null.c:47
TM_ECODE_FAILED
@ TM_ECODE_FAILED
Definition: tm-threads-common.h:81
util-unittest.h
TM_ECODE_OK
@ TM_ECODE_OK
Definition: tm-threads-common.h:80
DecodeNull
int DecodeNull(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint32_t len)
Definition: decode-null.c:49
decode.h
util-debug.h
type
uint8_t type
Definition: decode-icmpv4.h:0
GET_PKT_DATA
#define GET_PKT_DATA(p)
Definition: decode.h:233
ThreadVars_
Per thread variable structure.
Definition: threadvars.h:58
pkt-var.h
util-profiling.h
Packet_
Definition: decode.h:416
DecodeIPV6
int DecodeIPV6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint16_t len)
Definition: decode-ipv6.c:564
GET_PKT_LEN
#define GET_PKT_LEN(p)
Definition: decode.h:232
DecodeNullRegisterTests
void DecodeNullRegisterTests(void)
Registers Null unit tests.
Definition: decode-null.c:93
decode-events.h
dtv
DecodeThreadVars * dtv
Definition: fuzz_decodepcapfile.c:30
suricata-common.h
tv
ThreadVars * tv
Definition: fuzz_decodepcapfile.c:29
LTNULL_UNSUPPORTED_TYPE
@ LTNULL_UNSUPPORTED_TYPE
Definition: decode-events.h:159
util-validate.h
DecodeThreadVars_
Structure to hold thread specific data for all decode modules.
Definition: decode.h:640
LTNULL_PKT_TOO_SMALL
@ LTNULL_PKT_TOO_SMALL
Definition: decode-events.h:158
DecodeThreadVars_::counter_null
uint16_t counter_null
Definition: decode.h:665
ENGINE_SET_INVALID_EVENT
#define ENGINE_SET_INVALID_EVENT(p, e)
Definition: decode.h:1031
DecodeIPV4
int DecodeIPV4(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint16_t len)
Definition: decode-ipv4.c:517
DEBUG_VALIDATE_BUG_ON
#define DEBUG_VALIDATE_BUG_ON(exp)
Definition: util-validate.h:111