detect-engine-mpm.h File Reference

#include "detect.h"

Include dependency graph for detect-engine-mpm.h:

Go to the source code of this file.

Data Structures
struct	PrefilterMpmListId
struct	MpmListIdDataArgs

Typedefs
typedef int(*	PrefilterRegisterFunc) (DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
typedef struct PrefilterMpmListId	PrefilterMpmListId

Functions
void	DetectMpmInitializeFrameMpms (DetectEngineCtx *de_ctx)
int	DetectMpmPrepareFrameMpms (DetectEngineCtx *de_ctx)
	initialize mpm contexts for applayer buffers that are in "single or "shared" mode. More...
void	DetectMpmInitializePktMpms (DetectEngineCtx *de_ctx)
int	DetectMpmPreparePktMpms (DetectEngineCtx *de_ctx)
	initialize mpm contexts for applayer buffers that are in "single or "shared" mode. More...
void	DetectMpmInitializeAppMpms (DetectEngineCtx *de_ctx)
int	DetectMpmPrepareAppMpms (DetectEngineCtx *de_ctx)
	initialize mpm contexts for applayer buffers that are in "single or "shared" mode. More...
void	DetectMpmInitializeBuiltinMpms (DetectEngineCtx *de_ctx)
int	DetectMpmPrepareBuiltinMpms (DetectEngineCtx *de_ctx)
	initialize mpm contexts for builtin buffers that are in "single or "shared" mode. More...
uint32_t	PatternStrength (uint8_t *, uint16_t)
	Predict a strength value for patterns. More...
uint8_t	PatternMatchDefaultMatcher (void)
	Function to return the multi pattern matcher algorithm to be used by the engine, based on the mpm-algo setting in yaml Use the default mpm if none is specified in the yaml file. More...
void	PatternMatchPrepare (MpmCtx *, uint16_t)
void	PatternMatchThreadPrepare (MpmThreadCtx *, uint16_t type)
void	PatternMatchDestroy (MpmCtx *, uint16_t)
void	PatternMatchThreadDestroy (MpmThreadCtx *mpm_thread_ctx, uint16_t)
int	PatternMatchPrepareGroup (DetectEngineCtx *, SigGroupHead *)
	Prepare the pattern matcher ctx in a sig group head. More...
int	SignatureHasPacketContent (const Signature *)
	check if a signature has patterns that are to be inspected against a packets payload (as opposed to the stream payload) More...
int	SignatureHasStreamContent (const Signature *)
	check if a signature has patterns that are to be inspected against the stream payload (as opposed to the individual packets payload(s)) More...
void	RetrieveFPForSig (const DetectEngineCtx *de_ctx, Signature *s)
int	MpmStoreInit (DetectEngineCtx *)
	Initializes the MpmStore mpm hash table to be used by the detection engine context. More...
void	MpmStoreFree (DetectEngineCtx *)
	Frees the hash table - DetectEngineCtx->mpm_hash_table, allocated by MpmStoreInit() function. More...
void	MpmStoreReportStats (const DetectEngineCtx *de_ctx)
MpmStore *	MpmStorePrepareBuffer (DetectEngineCtx *de_ctx, SigGroupHead *sgh, enum MpmBuiltinBuffers buf)
	Get MpmStore for a built-in buffer type. More...
int	DetectSetFastPatternAndItsId (DetectEngineCtx *de_ctx)
	Figure out the FP and their respective content ids for all the sigs in the engine. More...
void	DetectAppLayerMpmRegister (const char *name, int direction, int priority, PrefilterRegisterFunc PrefilterRegister, InspectionBufferGetDataPtr GetData, AppProto alproto, int tx_min_progress)
	register an app layer keyword for mpm More...
void	DetectAppLayerMpmRegisterSingle (const char *name, int direction, int priority, PrefilterRegisterFunc PrefilterRegister, InspectionSingleBufferGetDataPtr GetData, AppProto alproto, int tx_min_progress)
void	DetectAppLayerMpmMultiRegister (const char *name, int direction, int priority, PrefilterRegisterFunc PrefilterRegister, InspectionMultiBufferGetDataPtr GetData, AppProto alproto, int tx_min_progress)
void	DetectAppLayerMpmRegisterByParentId (DetectEngineCtx *de_ctx, const int id, const int parent_id, DetectEngineTransforms *transforms)
	copy a mpm engine from parent_id, add in transforms More...
void	DetectPktMpmRegister (const char *name, int priority, PrefilterRegisterFunc PrefilterRegister, InspectionBufferGetPktDataPtr GetData)
void	DetectPktMpmRegisterByParentId (DetectEngineCtx *de_ctx, const int id, const int parent_id, DetectEngineTransforms *transforms)
	copy a mpm engine from parent_id, add in transforms More...
void	DetectFrameMpmRegister (const char *name, int direction, int priority, int(*PrefilterRegister)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id), AppProto alproto, uint8_t type)
	register a MPM engine More...
void	DetectFrameMpmRegisterByParentId (DetectEngineCtx *de_ctx, const int id, const int parent_id, DetectEngineTransforms *transforms)
	copy a mpm engine from parent_id, add in transforms More...
void	DetectEngineFrameMpmRegister (DetectEngineCtx *de_ctx, const char *name, int direction, int priority, int(*PrefilterRegister)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id), AppProto alproto, uint8_t type)
int	PrefilterGenericMpmFrameRegister (DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
void	EngineAnalysisAddAllRulePatterns (DetectEngineCtx *de_ctx, const Signature *s)
	add all patterns on our stats hash Used to fill the hash later used by DumpPatterns() More...
bool	DetectBufferToClient (const DetectEngineCtx *de_ctx, int buf_id, AppProto alproto)

Detailed Description

Author

Victor Julien victo.nosp@m.r@in.nosp@m.linia.nosp@m.c.ne.nosp@m.t

Definition in file detect-engine-mpm.h.

Typedef Documentation

PrefilterMpmListId

typedef struct PrefilterMpmListId PrefilterMpmListId

PrefilterRegisterFunc

typedef int(* PrefilterRegisterFunc) (DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)

Definition at line 72 of file detect-engine-mpm.h.

Function Documentation

DetectAppLayerMpmMultiRegister()

void DetectAppLayerMpmMultiRegister	(	const char *	name,
		int	direction,
		int	priority,
		PrefilterRegisterFunc	PrefilterRegister,
		InspectionMultiBufferGetDataPtr	GetData,
		AppProto	alproto,
		int	tx_min_progress
	)

Definition at line 168 of file detect-engine-mpm.c.

DetectAppLayerMpmRegister()

void DetectAppLayerMpmRegister	(	const char *	name,
		int	direction,
		int	priority,
		PrefilterRegisterFunc	PrefilterRegister,
		InspectionBufferGetDataPtr	GetData,
		AppProto	alproto,
		int	tx_min_progress
	)

register an app layer keyword for mpm

Parameters

name	buffer name
direction	SIG_FLAG_TOSERVER or SIG_FLAG_TOCLIENT
priority	mpm keyword priority
PrefilterRegister	Prefilter api registration function
GetData	callback to setup a InspectBuffer. May be NULL.
alproto	AppProto this MPM engine inspects
tx_min_progress	min tx progress needed to invoke this engine.

Note

direction must be set to either toserver or toclient. If both are needed, register the keyword twice.

Definition at line 152 of file detect-engine-mpm.c.

Referenced by DetectFileRegisterFileProtocols().

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DetectAppLayerMpmRegisterByParentId()

void DetectAppLayerMpmRegisterByParentId	(	DetectEngineCtx *	de_ctx,
		const int	id,
		const int	parent_id,
		DetectEngineTransforms *	transforms
	)

copy a mpm engine from parent_id, add in transforms

Definition at line 177 of file detect-engine-mpm.c.

References DetectEngineCtx_::app_mpms_list, DetectEngineCtx_::app_mpms_list_cnt, DetectBufferMpmRegistry_::app_v2, BUG_ON, DetectEngineTransforms::cnt, de_ctx, DEBUG_VALIDATE_BUG_ON, DETECT_BUFFER_MPM_TYPE_APP, DetectEngineRegisterFastPatternForId(), DetectBufferMpmRegistry_::direction, DetectBufferMpmRegistry_::id, id, MpmFactoryRegisterMpmCtxProfile(), DetectBufferMpmRegistry_::name, SigTableElmt_::name, DetectBufferMpmRegistry_::next, DetectBufferMpmRegistry_::pname, DetectBufferMpmRegistry_::PrefilterRegisterWithListId, DetectBufferMpmRegistry_::priority, SCCalloc, SCLogDebug, DetectBufferMpmRegistry_::sgh_mpm_context, ShortenString(), sigmatch_table, DetectBufferMpmRegistry_::sm_list, DetectBufferMpmRegistry_::sm_list_base, strlcat(), strlcpy(), TransformData_::transform, DetectEngineTransforms::transforms, DetectBufferMpmRegistry_::transforms, and DetectBufferMpmRegistry_::type.

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DetectAppLayerMpmRegisterSingle()

void DetectAppLayerMpmRegisterSingle	(	const char *	name,
		int	direction,
		int	priority,
		PrefilterRegisterFunc	PrefilterRegister,
		InspectionSingleBufferGetDataPtr	GetData,
		AppProto	alproto,
		int	tx_min_progress
	)

Definition at line 160 of file detect-engine-mpm.c.

DetectBufferToClient()

bool DetectBufferToClient	(	const DetectEngineCtx *	de_ctx,
		int	buf_id,
		AppProto	alproto
	)

Definition at line 1074 of file detect-engine-mpm.c.

References DetectEngineCtx_::app_inspect_engines, de_ctx, DetectEngineAppInspectionEngine_::next, and DetectEngineAppInspectionEngine_::sm_list.

DetectEngineFrameMpmRegister()

void DetectEngineFrameMpmRegister	(	DetectEngineCtx *	de_ctx,
		const char *	name,
		int	direction,
		int	priority,
		int(*)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)	PrefilterRegister,
		AppProto	alproto,
		uint8_t	type
	)

Definition at line 407 of file detect-engine-mpm.c.

References AppProtoToString(), BUG_ON, de_ctx, DETECT_BUFFER_MPM_TYPE_FRAME, DetectEngineBufferTypeRegister(), DetectEngineBufferTypeSupportsFrames(), DetectEngineBufferTypeSupportsMpm(), DetectEngineBufferTypeSupportsTransformations(), DetectEngineRegisterFastPatternForId(), DetectBufferMpmRegistry_::direction, ENGINE_SGH_MPM_FACTORY_CONTEXT_SINGLE, FatalError, DetectEngineCtx_::frame_mpms_list, DetectEngineCtx_::frame_mpms_list_cnt, DetectBufferMpmRegistry_::frame_v1, MPM_CTX_FACTORY_UNIQUE_CONTEXT, MpmFactoryRegisterMpmCtxProfile(), DetectBufferMpmRegistry_::name, name, DetectBufferMpmRegistry_::next, DetectBufferMpmRegistry_::pname, DetectBufferMpmRegistry_::PrefilterRegisterWithListId, DetectBufferMpmRegistry_::priority, SCCalloc, SCConfGetBool(), SCLogDebug, DetectBufferMpmRegistry_::sgh_mpm_context, DetectEngineCtx_::sgh_mpm_ctx_cnf, DetectBufferMpmRegistry_::sm_list, type, and DetectBufferMpmRegistry_::type.

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DetectFrameMpmRegister()

void DetectFrameMpmRegister	(	const char *	name,
		int	direction,
		int	priority,
		int(*)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)	PrefilterRegister,
		AppProto	alproto,
		uint8_t	type
	)

register a MPM engine

Note

to be used at start up / registration only. Errors are fatal.

Definition at line 320 of file detect-engine-mpm.c.

References AppProtoToString(), BUG_ON, DETECT_BUFFER_MPM_TYPE_FRAME, DetectBufferTypeGetByName(), DetectBufferTypeSupportsFrames(), DetectBufferTypeSupportsMpm(), DetectBufferTypeSupportsTransformations(), DetectBufferMpmRegistry_::direction, FatalError, DetectBufferMpmRegistry_::frame_v1, DetectBufferMpmRegistry_::name, name, DetectBufferMpmRegistry_::pname, DetectBufferMpmRegistry_::PrefilterRegisterWithListId, DetectBufferMpmRegistry_::priority, SCCalloc, SCLogDebug, DetectBufferMpmRegistry_::sm_list, type, and DetectBufferMpmRegistry_::type.

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DetectFrameMpmRegisterByParentId()

void DetectFrameMpmRegisterByParentId	(	DetectEngineCtx *	de_ctx,
		const int	id,
		const int	parent_id,
		DetectEngineTransforms *	transforms
	)

copy a mpm engine from parent_id, add in transforms

Definition at line 368 of file detect-engine-mpm.c.

References BUG_ON, de_ctx, DEBUG_VALIDATE_BUG_ON, DETECT_BUFFER_MPM_TYPE_FRAME, DetectEngineRegisterFastPatternForId(), DetectBufferMpmRegistry_::direction, DetectEngineCtx_::frame_mpms_list, DetectEngineCtx_::frame_mpms_list_cnt, DetectBufferMpmRegistry_::frame_v1, DetectBufferMpmRegistry_::id, DetectBufferMpmRegistry_::name, DetectBufferMpmRegistry_::next, DetectBufferMpmRegistry_::pname, DetectBufferMpmRegistry_::PrefilterRegisterWithListId, DetectBufferMpmRegistry_::priority, SCCalloc, SCLogDebug, DetectBufferMpmRegistry_::sgh_mpm_context, DetectBufferMpmRegistry_::sm_list, DetectBufferMpmRegistry_::sm_list_base, DetectBufferMpmRegistry_::transforms, and DetectBufferMpmRegistry_::type.

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DetectMpmInitializeAppMpms()

void DetectMpmInitializeAppMpms

(

DetectEngineCtx *

de_ctx

)

Definition at line 245 of file detect-engine-mpm.c.

DetectMpmInitializeBuiltinMpms()

void DetectMpmInitializeBuiltinMpms

(

DetectEngineCtx *

de_ctx

)

Definition at line 733 of file detect-engine-mpm.c.

References de_ctx, and DetectEngineCtx_::sgh_mpm_context_proto_tcp_packet.

DetectMpmInitializeFrameMpms()

void DetectMpmInitializeFrameMpms

(

DetectEngineCtx *

de_ctx

)

Definition at line 470 of file detect-engine-mpm.c.

DetectMpmInitializePktMpms()

void DetectMpmInitializePktMpms

(

DetectEngineCtx *

de_ctx

)

Definition at line 635 of file detect-engine-mpm.c.

DetectMpmPrepareAppMpms()

int DetectMpmPrepareAppMpms

(

DetectEngineCtx *

de_ctx

)

initialize mpm contexts for applayer buffers that are in "single or "shared" mode.

Definition at line 295 of file detect-engine-mpm.c.

References DetectEngineCtx_::app_mpms_list, de_ctx, DetectBufferMpmRegistry_::direction, DetectEngineCtx_::mpm_cfg, MPM_CTX_FACTORY_UNIQUE_CONTEXT, DetectEngineCtx_::mpm_matcher, mpm_table, MpmFactoryGetMpmCtxForProfile(), DetectBufferMpmRegistry_::next, MpmTableElmt_::Prepare, DetectBufferMpmRegistry_::sgh_mpm_context, and SIG_FLAG_TOSERVER.

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DetectMpmPrepareBuiltinMpms()

int DetectMpmPrepareBuiltinMpms

(

DetectEngineCtx *

de_ctx

)

initialize mpm contexts for builtin buffers that are in "single or "shared" mode.

Definition at line 746 of file detect-engine-mpm.c.

References de_ctx, DetectEngineCtx_::mpm_cfg, MPM_CTX_FACTORY_UNIQUE_CONTEXT, DetectEngineCtx_::mpm_matcher, mpm_table, MpmFactoryGetMpmCtxForProfile(), MpmTableElmt_::Prepare, DetectEngineCtx_::sgh_mpm_context_proto_other_packet, DetectEngineCtx_::sgh_mpm_context_proto_tcp_packet, DetectEngineCtx_::sgh_mpm_context_proto_udp_packet, and DetectEngineCtx_::sgh_mpm_context_stream.

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DetectMpmPrepareFrameMpms()

int DetectMpmPrepareFrameMpms

(

DetectEngineCtx *

de_ctx

)

initialize mpm contexts for applayer buffers that are in "single or "shared" mode.

Definition at line 522 of file detect-engine-mpm.c.

References de_ctx, DetectBufferMpmRegistry_::direction, DetectEngineCtx_::frame_mpms_list, DetectEngineCtx_::mpm_cfg, MPM_CTX_FACTORY_UNIQUE_CONTEXT, DetectEngineCtx_::mpm_matcher, mpm_table, MpmFactoryGetMpmCtxForProfile(), DetectBufferMpmRegistry_::name, DetectBufferMpmRegistry_::next, MpmTableElmt_::Prepare, SCLogDebug, DetectBufferMpmRegistry_::sgh_mpm_context, and SIG_FLAG_TOSERVER.

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DetectMpmPreparePktMpms()

int DetectMpmPreparePktMpms

(

DetectEngineCtx *

de_ctx

)

initialize mpm contexts for applayer buffers that are in "single or "shared" mode.

Definition at line 687 of file detect-engine-mpm.c.

References de_ctx, DetectEngineCtx_::mpm_cfg, MPM_CTX_FACTORY_UNIQUE_CONTEXT, DetectEngineCtx_::mpm_matcher, mpm_table, MpmFactoryGetMpmCtxForProfile(), DetectBufferMpmRegistry_::name, DetectBufferMpmRegistry_::next, DetectEngineCtx_::pkt_mpms_list, MpmTableElmt_::Prepare, SCLogDebug, and DetectBufferMpmRegistry_::sgh_mpm_context.

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DetectPktMpmRegister()

void DetectPktMpmRegister	(	const char *	name,
		int	priority,
		PrefilterRegisterFunc	PrefilterRegister,
		InspectionBufferGetPktDataPtr	GetData
	)

DetectPktMpmRegisterByParentId()

void DetectPktMpmRegisterByParentId	(	DetectEngineCtx *	de_ctx,
		const int	id,
		const int	parent_id,
		DetectEngineTransforms *	transforms
	)

copy a mpm engine from parent_id, add in transforms

Definition at line 597 of file detect-engine-mpm.c.

References BUG_ON, de_ctx, DEBUG_VALIDATE_BUG_ON, DETECT_BUFFER_MPM_TYPE_PKT, DetectEngineRegisterFastPatternForId(), DetectBufferMpmRegistry_::id, DetectBufferMpmRegistry_::name, DetectBufferMpmRegistry_::next, DetectEngineCtx_::pkt_mpms_list, DetectEngineCtx_::pkt_mpms_list_cnt, DetectBufferMpmRegistry_::pkt_v1, DetectBufferMpmRegistry_::pname, DetectBufferMpmRegistry_::PrefilterRegisterWithListId, DetectBufferMpmRegistry_::priority, SCCalloc, SCLogDebug, DetectBufferMpmRegistry_::sgh_mpm_context, DetectBufferMpmRegistry_::sm_list, DetectBufferMpmRegistry_::sm_list_base, DetectBufferMpmRegistry_::transforms, and DetectBufferMpmRegistry_::type.

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DetectSetFastPatternAndItsId()

int DetectSetFastPatternAndItsId

(

DetectEngineCtx *

de_ctx

)

Figure out the FP and their respective content ids for all the sigs in the engine.

Parameters

de_ctx

Detection engine context.

Return values

0	On success.
-1	On failure.

Definition at line 2459 of file detect-engine-mpm.c.

References cnt, de_ctx, HashListTableInit(), Signature_::init_data, SignatureInitData_::mpm_sm, Signature_::next, and DetectEngineCtx_::sig_list.

Referenced by SigGroupBuild().

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EngineAnalysisAddAllRulePatterns()

void EngineAnalysisAddAllRulePatterns	(	DetectEngineCtx *	de_ctx,
		const Signature *	s
	)

add all patterns on our stats hash Used to fill the hash later used by DumpPatterns()

Note

sets up the hash table on first call

Definition at line 2516 of file detect-engine-mpm.c.

References de_ctx, HashListTableInit(), and DetectEngineCtx_::pattern_hash_table.

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MpmStoreFree()

void MpmStoreFree

(

DetectEngineCtx *

de_ctx

)

Frees the hash table - DetectEngineCtx->mpm_hash_table, allocated by MpmStoreInit() function.

Parameters

de_ctx

Pointer to the detection engine context.

Definition at line 1569 of file detect-engine-mpm.c.

References de_ctx, HashListTableFree(), and DetectEngineCtx_::mpm_hash_table.

Referenced by DetectEngineCtxFree().

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MpmStoreInit()

int MpmStoreInit

(

DetectEngineCtx *

de_ctx

)

Initializes the MpmStore mpm hash table to be used by the detection engine context.

Parameters

de_ctx

Pointer to the detection engine context.

Return values

0	On success.
-1	On failure.

Definition at line 1406 of file detect-engine-mpm.c.

References de_ctx, HashListTableInit(), and DetectEngineCtx_::mpm_hash_table.

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MpmStorePrepareBuffer()

MpmStore* MpmStorePrepareBuffer	(	DetectEngineCtx *	de_ctx,
		SigGroupHead *	sgh,
		enum MpmBuiltinBuffers	buf
	)

Get MpmStore for a built-in buffer type.

Definition at line 1677 of file detect-engine-mpm.c.

References BUG_ON, cnt, de_ctx, DETECT_SM_LIST_PMATCH, DetectEngineGetMaxSigId, SigGroupHead_::init, Signature_::init_data, SigGroupHeadInitData_::match_array, SignatureInitData_::mpm_sm, MPMB_MAX, MPMB_OTHERIP, MPMB_TCP_PKT_TC, MPMB_TCP_PKT_TS, MPMB_TCP_STREAM_TC, MPMB_TCP_STREAM_TS, MPMB_UDP_TC, MPMB_UDP_TS, DetectEngineCtx_::sgh_mpm_context_proto_other_packet, DetectEngineCtx_::sgh_mpm_context_proto_tcp_packet, DetectEngineCtx_::sgh_mpm_context_proto_udp_packet, DetectEngineCtx_::sgh_mpm_context_stream, SigGroupHeadInitData_::sig_cnt, SIG_FLAG_TOCLIENT, and SIG_FLAG_TOSERVER.

Referenced by PatternMatchPrepareGroup().

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MpmStoreReportStats()

void MpmStoreReportStats

(

const DetectEngineCtx *

de_ctx

)

Definition at line 1472 of file detect-engine-mpm.c.

References MpmStore_::buffer, DetectEngineCtx_::buffer_type_id, de_ctx, DETECT_SM_LIST_PMATCH, HashListTableGetListData, HashListTableGetListHead(), HashListTableGetListNext, MpmStore_::mpm_ctx, DetectEngineCtx_::mpm_hash_table, MPMB_MAX, and MpmStore_::sm_list.

Referenced by SigPrepareStage4().

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PatternMatchDefaultMatcher()

uint8_t PatternMatchDefaultMatcher

(

void

)

Function to return the multi pattern matcher algorithm to be used by the engine, based on the mpm-algo setting in yaml Use the default mpm if none is specified in the yaml file.

Return values

mpm	algo value

Definition at line 861 of file detect-engine-mpm.c.

References FatalError, mpm_default_matcher, mpm_table, MPM_TABLE_SIZE, name, SCConfGet(), and SCLogWarning.

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PatternMatchDestroy()

void PatternMatchDestroy	(	MpmCtx *	,
		uint16_t
	)

Definition at line 907 of file detect-engine-mpm.c.

References MpmTableElmt_::DestroyCtx, mpm_table, and SCLogDebug.

PatternMatchPrepare()

void PatternMatchPrepare	(	MpmCtx *	,
		uint16_t
	)

PatternMatchPrepareGroup()

int PatternMatchPrepareGroup	(	DetectEngineCtx *	de_ctx,
		SigGroupHead *	sh
	)

Prepare the pattern matcher ctx in a sig group head.

Definition at line 2268 of file detect-engine-mpm.c.

References de_ctx, MpmStore_::mpm_ctx, MPMB_TCP_PKT_TS, MPMB_TCP_STREAM_TS, MpmStorePrepareBuffer(), PrefilterPktPayloadRegister(), PrefilterPktStreamRegister(), SGH_DIRECTION_TS, and SGH_PROTO.

Referenced by PrefilterSetupRuleGroup().

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PatternMatchThreadDestroy()

void PatternMatchThreadDestroy	(	MpmThreadCtx *	mpm_thread_ctx,
		uint16_t
	)

Definition at line 913 of file detect-engine-mpm.c.

References MpmDestroyThreadCtx(), and SCLogDebug.

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PatternMatchThreadPrepare()

void PatternMatchThreadPrepare	(	MpmThreadCtx *	,
		uint16_t	type
	)

Definition at line 918 of file detect-engine-mpm.c.

References MpmInitThreadCtx(), and SCLogDebug.

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PatternStrength()

uint32_t PatternStrength	(	uint8_t *	pat,
		uint16_t	patlen
	)

Predict a strength value for patterns.

Patterns with high character diversity score higher. Alpha chars score not so high Other printable + a few common codes a little higher Everything else highest. Longer patterns score better than short patters.

Parameters

pat	pattern
patlen	length of the pattern

Return values

s	pattern score

Definition at line 937 of file detect-engine-mpm.c.

PrefilterGenericMpmFrameRegister()

int PrefilterGenericMpmFrameRegister	(	DetectEngineCtx *	de_ctx,
		SigGroupHead *	sgh,
		MpmCtx *	mpm_ctx,
		const DetectBufferMpmRegistry *	mpm_reg,
		int	list_id
	)

Definition at line 208 of file detect-engine-frame.c.

References ALPROTO_UNKNOWN, BUG_ON, de_ctx, DetectBufferMpmRegistry_::frame_v1, FrameStreamData::list_id, PrefilterMpmFrameCtx::list_id, FrameStreamData::mpm_ctx, PrefilterMpmFrameCtx::mpm_ctx, PrefilterAppendFrameEngine(), SCCalloc, SCEnter, PrefilterMpmFrameCtx::transforms, and DetectBufferMpmRegistry_::transforms.

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RetrieveFPForSig()

void RetrieveFPForSig	(	const DetectEngineCtx *	de_ctx,
		Signature *	s
	)

Definition at line 1093 of file detect-engine-mpm.c.

References de_ctx, DETECT_CONTENT, DETECT_CONTENT_FAST_PATTERN, DETECT_SM_LIST_PMATCH, FastPatternSupportEnabledForSigMatchList(), DetectContentData_::flags, g_skip_prefilter, Signature_::init_data, SignatureInitData_::max_content_list_id, SignatureInitData_::mpm_sm, SigMatch_::next, and SignatureInitData_::smlists.

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SignatureHasPacketContent()

int SignatureHasPacketContent

(

const Signature *

s

)

check if a signature has patterns that are to be inspected against a packets payload (as opposed to the stream payload)

Parameters

s

signature

Return values

1	true
0	false

Definition at line 803 of file detect-engine-mpm.c.

References DETECT_SM_LIST_PMATCH, Signature_::flags, Signature_::init_data, DetectProto_::proto, Signature_::proto, SCEnter, SCLogDebug, SCReturnInt, SIG_FLAG_REQUIRE_PACKET, and SignatureInitData_::smlists.

SignatureHasStreamContent()

int SignatureHasStreamContent

(

const Signature *

s

)

check if a signature has patterns that are to be inspected against the stream payload (as opposed to the individual packets payload(s))

Parameters

s

signature

Return values

1	true
0	false

Definition at line 833 of file detect-engine-mpm.c.

References DETECT_SM_LIST_PMATCH, Signature_::flags, Signature_::init_data, DetectProto_::proto, Signature_::proto, SCEnter, SCLogDebug, SCReturnInt, SIG_FLAG_REQUIRE_STREAM, and SignatureInitData_::smlists.