suricata
decode-sll2.c
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1 /* Copyright (C) 2025 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  * \file
26  *
27  * \author Jeff Lucovsky <jeff.lucovsky@corelight.com>
28  *
29  * Decodes Sll2
30  */
31 
32 #include "suricata-common.h"
33 #include "decode.h"
34 #include "decode-sll2.h"
35 #include "decode-events.h"
36 
37 #include "util-validate.h"
38 #include "util-debug.h"
39 
40 int DecodeSll2(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint32_t len)
41 {
42  DEBUG_VALIDATE_BUG_ON(pkt == NULL);
43 
45 
46  if (unlikely(len < SLL2_HEADER_LEN)) {
48  return TM_ECODE_FAILED;
49  }
50  if (!PacketIncreaseCheckLayers(p)) {
51  return TM_ECODE_FAILED;
52  }
53 
54  Sll2Hdr *sll2h = (Sll2Hdr *)pkt;
55 
56  SCLogDebug("p %p pkt %p sll2_protocol %04x", p, pkt, SCNtohs(sll2h->sll_protocol));
57 
58  DecodeNetworkLayer(
59  tv, dtv, SCNtohs(sll2h->sll_protocol), p, pkt + SLL2_HEADER_LEN, len - SLL2_HEADER_LEN);
60 
61  return TM_ECODE_OK;
62 }
63 /**
64  * @}
65  */
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:166
unlikely
#define unlikely(expr)
Definition: util-optimize.h:35
decode-sll2.h
SCLogDebug
#define SCLogDebug(...)
Definition: util-debug.h:270
TM_ECODE_FAILED
@ TM_ECODE_FAILED
Definition: tm-threads-common.h:82
DecodeThreadVars_::counter_sll2
uint16_t counter_sll2
Definition: decode.h:984
TM_ECODE_OK
@ TM_ECODE_OK
Definition: tm-threads-common.h:81
decode.h
util-debug.h
ThreadVars_
Per thread variable structure.
Definition: threadvars.h:58
Packet_
Definition: decode.h:492
SLL2_HEADER_LEN
#define SLL2_HEADER_LEN
Definition: decode-sll2.h:27
decode-events.h
dtv
DecodeThreadVars * dtv
Definition: fuzz_decodepcapfile.c:33
SCNtohs
#define SCNtohs(x)
Definition: suricata-common.h:431
suricata-common.h
tv
ThreadVars * tv
Definition: fuzz_decodepcapfile.c:32
util-validate.h
DecodeThreadVars_
Structure to hold thread specific data for all decode modules.
Definition: decode.h:954
SLL2_PKT_TOO_SMALL
@ SLL2_PKT_TOO_SMALL
Definition: decode-events.h:115
ENGINE_SET_INVALID_EVENT
#define ENGINE_SET_INVALID_EVENT(p, e)
Definition: decode.h:1183
DecodeSll2
int DecodeSll2(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint32_t len)
Definition: decode-sll2.c:40
DEBUG_VALIDATE_BUG_ON
#define DEBUG_VALIDATE_BUG_ON(exp)
Definition: util-validate.h:102