suricata
decode-null.c
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1 /* Copyright (C) 2015 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-unittest.h"
40 #include "util-debug.h"
41 
42 #include "pkt-var.h"
43 #include "util-profiling.h"
44 #include "host.h"
45 
46 #define HDR_SIZE 4
47 
49  const uint8_t *pkt, uint32_t len, PacketQueue *pq)
50 {
51  StatsIncr(tv, dtv->counter_null);
52 
53  if (unlikely(len < HDR_SIZE)) {
55  return TM_ECODE_FAILED;
56  }
57 
58  if (unlikely(GET_PKT_LEN(p) > HDR_SIZE + USHRT_MAX)) {
59  return TM_ECODE_FAILED;
60  }
61 
62  uint32_t type = *((uint32_t *)pkt);
63  switch(type) {
64  case AF_INET:
65  SCLogDebug("IPV4 Packet");
66  DecodeIPV4(tv, dtv, p, GET_PKT_DATA(p)+HDR_SIZE, GET_PKT_LEN(p)-HDR_SIZE, pq);
67  break;
68  case AF_INET6:
69  SCLogDebug("IPV6 Packet");
70  DecodeIPV6(tv, dtv, p, GET_PKT_DATA(p)+HDR_SIZE, GET_PKT_LEN(p)-HDR_SIZE, pq);
71  break;
72  default:
73  SCLogDebug("Unknown Null packet type version %" PRIu32 "", type);
75  break;
76  }
77  return TM_ECODE_OK;
78 }
79 
80 #ifdef UNITTESTS
81 
82 #endif /* UNITTESTS */
83 
84 /**
85  * \brief Registers Null unit tests
86  */
88 {
89 #ifdef UNITTESTS
90 #endif /* UNITTESTS */
91 }
92 /**
93  * @}
94  */
#define ENGINE_SET_EVENT(p, e)
Definition: decode.h:993
#define SCLogDebug(...)
Definition: util-debug.h:335
void DecodeNullRegisterTests(void)
Registers Null unit tests.
Definition: decode-null.c:87
#define unlikely(expr)
Definition: util-optimize.h:35
uint16_t counter_null
Definition: decode.h:656
int DecodeNull(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint32_t len, PacketQueue *pq)
Definition: decode-null.c:48
uint8_t type
Structure to hold thread specific data for all decode modules.
Definition: decode.h:633
#define HDR_SIZE
Definition: decode-null.c:46
void StatsIncr(ThreadVars *tv, uint16_t id)
Increments the local counter.
Definition: counters.c:168
int DecodeIPV6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint16_t len, PacketQueue *pq)
Definition: decode-ipv6.c:585
int DecodeIPV4(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint16_t len, PacketQueue *pq)
Definition: decode-ipv4.c:532
#define GET_PKT_DATA(p)
Definition: decode.h:226
uint8_t len
Per thread variable structure.
Definition: threadvars.h:57
#define GET_PKT_LEN(p)
Definition: decode.h:225
#define ENGINE_SET_INVALID_EVENT(p, e)
Definition: decode.h:1001