mirror of https://github.com/OISF/suricata
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/* Copyright (C) 2007-2016 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.
|
|
*/
|
|
|
|
#ifndef __DETECT_ENGINE_PREFILTER_COMMON_H__
|
|
#define __DETECT_ENGINE_PREFILTER_COMMON_H__
|
|
|
|
typedef union {
|
|
uint8_t u8[8];
|
|
uint16_t u16[4];
|
|
uint32_t u32[2];
|
|
uint64_t u64;
|
|
} PrefilterPacketHeaderValue;
|
|
|
|
#define PREFILTER_EXTRA_MATCH_UNUSED 0
|
|
#define PREFILTER_EXTRA_MATCH_ALPROTO 1
|
|
#define PREFILTER_EXTRA_MATCH_SRCPORT 2
|
|
#define PREFILTER_EXTRA_MATCH_DSTPORT 3
|
|
|
|
typedef struct PrefilterPacketHeaderCtx_ {
|
|
PrefilterPacketHeaderValue v1;
|
|
|
|
uint16_t type;
|
|
uint16_t value;
|
|
|
|
/** rules to add when the flags are present */
|
|
uint32_t sigs_cnt;
|
|
SigIntId *sigs_array;
|
|
} PrefilterPacketHeaderCtx;
|
|
|
|
typedef struct SigsArray_ {
|
|
SigIntId *sigs;
|
|
uint32_t cnt;
|
|
uint32_t offset; // used to track assign pos
|
|
} SigsArray;
|
|
|
|
typedef struct PrefilterPacketU8HashCtx_ {
|
|
SigsArray *array[256];
|
|
} PrefilterPacketU8HashCtx;
|
|
|
|
#define PREFILTER_U8HASH_MODE_EQ 0
|
|
#define PREFILTER_U8HASH_MODE_LT 1
|
|
#define PREFILTER_U8HASH_MODE_GT 2
|
|
#define PREFILTER_U8HASH_MODE_RA 3
|
|
|
|
int PrefilterSetupPacketHeader(DetectEngineCtx *de_ctx,
|
|
SigGroupHead *sgh, int sm_type,
|
|
void (*Set)(PrefilterPacketHeaderValue *v, void *),
|
|
_Bool (*Compare)(PrefilterPacketHeaderValue v, void *),
|
|
void (*Match)(DetectEngineThreadCtx *det_ctx,
|
|
Packet *p, const void *pectx));
|
|
|
|
int PrefilterSetupPacketHeaderU8Hash(DetectEngineCtx *de_ctx,
|
|
SigGroupHead *sgh, int sm_type,
|
|
void (*Set)(PrefilterPacketHeaderValue *v, void *),
|
|
_Bool (*Compare)(PrefilterPacketHeaderValue v, void *),
|
|
void (*Match)(DetectEngineThreadCtx *det_ctx,
|
|
Packet *p, const void *pectx));
|
|
|
|
static inline _Bool
|
|
PrefilterPacketHeaderExtraMatch(const PrefilterPacketHeaderCtx *ctx,
|
|
const Packet *p)
|
|
{
|
|
switch (ctx->type)
|
|
{
|
|
case PREFILTER_EXTRA_MATCH_UNUSED:
|
|
break;
|
|
case PREFILTER_EXTRA_MATCH_ALPROTO:
|
|
if (p->flow == NULL || p->flow->alproto != ctx->value)
|
|
return FALSE;
|
|
break;
|
|
case PREFILTER_EXTRA_MATCH_SRCPORT:
|
|
if (p->sp != ctx->value)
|
|
return FALSE;
|
|
break;
|
|
case PREFILTER_EXTRA_MATCH_DSTPORT:
|
|
if (p->dp != ctx->value)
|
|
return FALSE;
|
|
break;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
#endif /* __DETECT_ENGINE_PREFILTER_COMMON_H__ */
|