suricata
decode-sctp.c
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1 /* Copyright (C) 2011-2021 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 Eric Leblond <eric@regit.org>
29  *
30  * Decode SCTP
31  */
32 
33 #include "suricata-common.h"
34 #include "decode.h"
35 #include "decode-sctp.h"
36 #include "decode-events.h"
37 
38 #include "util-validate.h"
39 #include "util-unittest.h"
40 #include "util-debug.h"
41 #include "util-optimize.h"
42 #include "flow.h"
43 
44 static int DecodeSCTPPacket(ThreadVars *tv, Packet *p, const uint8_t *pkt, uint16_t len)
45 {
46  DEBUG_VALIDATE_BUG_ON(pkt == NULL);
47 
48  if (unlikely(len < SCTP_HEADER_LEN)) {
50  return -1;
51  }
52 
53  SCTPHdr *sctph = PacketSetSCTP(p, pkt);
54  p->sp = SCNtohs(sctph->sh_sport);
55  p->dp = SCNtohs(sctph->sh_dport);
56  p->payload = (uint8_t *)pkt + sizeof(SCTPHdr);
57  p->payload_len = len - sizeof(SCTPHdr);
58  p->proto = IPPROTO_SCTP;
59  return 0;
60 }
61 
63  const uint8_t *pkt, uint16_t len)
64 {
66 
67  if (unlikely(DecodeSCTPPacket(tv, p,pkt,len) < 0)) {
68  PacketClearL4(p);
69  return TM_ECODE_FAILED;
70  }
71 
72  SCLogDebug("SCTP sp: %u -> dp: %u", p->sp, p->dp);
73 
74  FlowSetupPacket(p);
75 
76  return TM_ECODE_OK;
77 }
78 /**
79  * @}
80  */
Packet_::proto
uint8_t proto
Definition: decode.h:504
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
SCLogDebug
#define SCLogDebug(...)
Definition: util-debug.h:269
Packet_::payload
uint8_t * payload
Definition: decode.h:588
SCTP_HEADER_LEN
#define SCTP_HEADER_LEN
Definition: decode-sctp.h:28
SCTP_PKT_TOO_SMALL
@ SCTP_PKT_TOO_SMALL
Definition: decode-events.h:163
TM_ECODE_FAILED
@ TM_ECODE_FAILED
Definition: tm-threads-common.h:85
Packet_::payload_len
uint16_t payload_len
Definition: decode.h:589
util-unittest.h
DecodeSCTP
int DecodeSCTP(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, const uint8_t *pkt, uint16_t len)
Definition: decode-sctp.c:62
TM_ECODE_OK
@ TM_ECODE_OK
Definition: tm-threads-common.h:84
decode.h
util-debug.h
ThreadVars_
Per thread variable structure.
Definition: threadvars.h:57
Packet_::sp
Port sp
Definition: decode.h:489
Packet_
Definition: decode.h:482
DecodeThreadVars_::counter_sctp
uint16_t counter_sctp
Definition: decode.h:977
decode-events.h
dtv
DecodeThreadVars * dtv
Definition: fuzz_decodepcapfile.c:33
SCNtohs
#define SCNtohs(x)
Definition: suricata-common.h:414
suricata-common.h
decode-sctp.h
tv
ThreadVars * tv
Definition: fuzz_decodepcapfile.c:32
util-optimize.h
util-validate.h
DecodeThreadVars_
Structure to hold thread specific data for all decode modules.
Definition: decode.h:946
ENGINE_SET_INVALID_EVENT
#define ENGINE_SET_INVALID_EVENT(p, e)
Definition: decode.h:1171
IPPROTO_SCTP
#define IPPROTO_SCTP
Definition: decode.h:1207
flow.h
Packet_::dp
Port dp
Definition: decode.h:497
DEBUG_VALIDATE_BUG_ON
#define DEBUG_VALIDATE_BUG_ON(exp)
Definition: util-validate.h:102
FlowSetupPacket
void FlowSetupPacket(Packet *p)
prepare packet for a life with flow Set PKT_WANTS_FLOW flag to indicate workers should do a flow look...
Definition: flow-hash.c:521