suricata
Data Structures | Macros | Typedefs | Functions | Variables
detect-engine-mpm.c File Reference
#include "suricata.h"
#include "suricata-common.h"
#include "app-layer-protos.h"
#include "decode.h"
#include "detect.h"
#include "detect-engine.h"
#include "detect-engine-siggroup.h"
#include "detect-engine-mpm.h"
#include "detect-engine-iponly.h"
#include "detect-parse.h"
#include "detect-engine-prefilter.h"
#include "util-mpm.h"
#include "util-memcmp.h"
#include "util-memcpy.h"
#include "conf.h"
#include "detect-fast-pattern.h"
#include "detect-tcphdr.h"
#include "detect-udphdr.h"
#include "flow.h"
#include "flow-var.h"
#include "detect-flow.h"
#include "detect-content.h"
#include "detect-engine-payload.h"
#include "stream.h"
#include "util-misc.h"
#include "util-enum.h"
#include "util-debug.h"
#include "util-print.h"
#include "util-validate.h"
#include "util-hash-string.h"
Include dependency graph for detect-engine-mpm.c:

Go to the source code of this file.

Data Structures

struct  SidsArray
 
struct  DetectBufferInstance
 

Macros

#define SGH_PROTO(sgh, p)   ((sgh)->init->protos[(p)] == 1)
 
#define SGH_DIRECTION_TS(sgh)   ((sgh)->init->direction & SIG_FLAG_TOSERVER)
 
#define SGH_DIRECTION_TC(sgh)   ((sgh)->init->direction & SIG_FLAG_TOCLIENT)
 

Typedefs

typedef struct DetectBufferInstance DetectBufferInstance
 

Functions

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 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 DetectMpmInitializeAppMpms (DetectEngineCtx *de_ctx)
 
int DetectMpmPrepareAppMpms (DetectEngineCtx *de_ctx)
 initialize mpm contexts for applayer buffers that are in "single or "shared" mode. 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)
 
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 DetectPktMpmRegister (const char *name, int priority, int(*PrefilterRegister)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id), InspectionBufferGetPktDataPtr GetData)
 register a MPM engine More...
 
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 DetectMpmInitializePktMpms (DetectEngineCtx *de_ctx)
 
int DetectMpmPreparePktMpms (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...
 
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) More...
 
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)) 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 PatternMatchDestroy (MpmCtx *mpm_ctx, uint16_t mpm_matcher)
 
void PatternMatchThreadDestroy (MpmThreadCtx *mpm_thread_ctx, uint16_t mpm_matcher)
 
void PatternMatchThreadPrepare (MpmThreadCtx *mpm_thread_ctx, uint16_t mpm_matcher)
 
uint32_t PatternStrength (uint8_t *pat, uint16_t patlen)
 Predict a strength value for patterns. More...
 
void RetrieveFPForSig (const DetectEngineCtx *de_ctx, Signature *s)
 
int MpmStoreInit (DetectEngineCtx *de_ctx)
 Initializes the MpmStore mpm hash table to be used by the detection engine context. More...
 
void MpmStoreReportStats (const DetectEngineCtx *de_ctx)
 
void MpmStoreFree (DetectEngineCtx *de_ctx)
 Frees the hash table - DetectEngineCtx->mpm_hash_table, allocated by MpmStoreInit() function. More...
 
MpmStore * MpmStorePrepareBuffer (DetectEngineCtx *de_ctx, SigGroupHead *sgh, enum MpmBuiltinBuffers buf)
 Get MpmStore for a built-in buffer type. More...
 
int PatternMatchPrepareGroup (DetectEngineCtx *de_ctx, SigGroupHead *sh)
 Prepare the pattern matcher ctx in a sig group head. More...
 
int DetectSetFastPatternAndItsId (DetectEngineCtx *de_ctx)
 Figure out the FP and their respective content ids for all the sigs in the engine. More...
 
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...
 

Variables

const char * builtin_mpms []
 
int g_skip_prefilter = 0
 

Detailed Description

Author
Victor Julien victo.nosp@m.r@in.nosp@m.linia.nosp@m.c.ne.nosp@m.t
Anoop Saldanha anoop.nosp@m.sald.nosp@m.anha@.nosp@m.gmai.nosp@m.l.com

Multi pattern matcher

Definition in file detect-engine-mpm.c.

Macro Definition Documentation

◆ SGH_DIRECTION_TC

#define SGH_DIRECTION_TC (   sgh)    ((sgh)->init->direction & SIG_FLAG_TOCLIENT)

Definition at line 1007 of file detect-engine-mpm.c.

◆ SGH_DIRECTION_TS

#define SGH_DIRECTION_TS (   sgh)    ((sgh)->init->direction & SIG_FLAG_TOSERVER)

Definition at line 1006 of file detect-engine-mpm.c.

◆ SGH_PROTO

#define SGH_PROTO (   sgh,
  p 
)    ((sgh)->init->protos[(p)] == 1)

Definition at line 1005 of file detect-engine-mpm.c.

Typedef Documentation

◆ DetectBufferInstance

typedef struct DetectBufferInstance DetectBufferInstance

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 159 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
namebuffer name
directionSIG_FLAG_TOSERVER or SIG_FLAG_TOCLIENT
prioritympm keyword priority
PrefilterRegisterPrefilter api registration function
GetDatacallback to setup a InspectBuffer. May be NULL.
alprotoAppProto this MPM engine inspects
tx_min_progressmin 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 151 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 168 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, 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.

Referenced by DetectEngineBufferTypeGetByIdTransforms().

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◆ 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 398 of file detect-engine-mpm.c.

References AppProtoToString(), BUG_ON, ConfGetBool(), 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, DetectBufferMpmRegistry_::next, DetectBufferMpmRegistry_::pname, DetectBufferMpmRegistry_::PrefilterRegisterWithListId, DetectBufferMpmRegistry_::priority, SCCalloc, 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 311 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, 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 359 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.

Referenced by DetectEngineBufferTypeGetByIdTransforms().

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◆ DetectMpmInitializeAppMpms()

void DetectMpmInitializeAppMpms ( DetectEngineCtx *  de_ctx)

Definition at line 236 of file detect-engine-mpm.c.

◆ DetectMpmInitializeBuiltinMpms()

void DetectMpmInitializeBuiltinMpms ( DetectEngineCtx *  de_ctx)

Definition at line 726 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 461 of file detect-engine-mpm.c.

◆ DetectMpmInitializePktMpms()

void DetectMpmInitializePktMpms ( DetectEngineCtx *  de_ctx)

Definition at line 628 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 286 of file detect-engine-mpm.c.

References DetectEngineCtx_::app_mpms_list, de_ctx, DetectBufferMpmRegistry_::direction, 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 739 of file detect-engine-mpm.c.

References de_ctx, 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 513 of file detect-engine-mpm.c.

References de_ctx, DetectBufferMpmRegistry_::direction, DetectEngineCtx_::frame_mpms_list, 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 680 of file detect-engine-mpm.c.

References de_ctx, 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,
int(*)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)  PrefilterRegister,
InspectionBufferGetPktDataPtr  GetData 
)

register a MPM engine

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

Definition at line 541 of file detect-engine-mpm.c.

◆ 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 590 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.

Referenced by DetectEngineBufferTypeGetByIdTransforms().

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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_ctxDetection engine context.
Return values
0On success.
-1On failure.

Definition at line 2417 of file detect-engine-mpm.c.

References cnt, de_ctx, Signature_::flags, HashListTableInit(), Signature_::init_data, SignatureInitData_::mpm_sm, Signature_::next, RetrieveFPForSig(), SIG_FLAG_PREFILTER, 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 2479 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_ctxPointer to the detection engine context.

Definition at line 1529 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_ctxPointer to the detection engine context.
Return values
0On success.
-1On failure.

Definition at line 1366 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 1634 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 1432 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
mpmalgo value

Definition at line 854 of file detect-engine-mpm.c.

References ConfGet(), FatalError, mpm_default_matcher, mpm_table, MPM_TABLE_SIZE, and SCLogWarning.

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◆ PatternMatchDestroy()

void PatternMatchDestroy ( MpmCtx *  mpm_ctx,
uint16_t  mpm_matcher 
)

Definition at line 900 of file detect-engine-mpm.c.

References MpmTableElmt_::DestroyCtx, mpm_table, and SCLogDebug.

◆ PatternMatchPrepareGroup()

int PatternMatchPrepareGroup ( DetectEngineCtx *  de_ctx,
SigGroupHead *  sh 
)

Prepare the pattern matcher ctx in a sig group head.

Definition at line 2226 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  mpm_matcher 
)

Definition at line 906 of file detect-engine-mpm.c.

References MpmDestroyThreadCtx(), and SCLogDebug.

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◆ PatternMatchThreadPrepare()

void PatternMatchThreadPrepare ( MpmThreadCtx *  mpm_thread_ctx,
uint16_t  mpm_matcher 
)

Definition at line 911 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
patpattern
patlenlength of the pattern
Return values
spattern score

Definition at line 930 of file detect-engine-mpm.c.

◆ RetrieveFPForSig()

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

Definition at line 1074 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.

Referenced by DetectSetFastPatternAndItsId().

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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
ssignature
Return values
1true
0false

Definition at line 796 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
ssignature
Return values
1true
0false

Definition at line 826 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.

Variable Documentation

◆ builtin_mpms

const char* builtin_mpms[]
Initial value:
= {
"toserver TCP packet",
"toclient TCP packet",
"toserver TCP stream",
"toclient TCP stream",
"toserver UDP packet",
"toclient UDP packet",
"other IP packet",
NULL }

Definition at line 66 of file detect-engine-mpm.c.

◆ g_skip_prefilter

int g_skip_prefilter = 0

Definition at line 1072 of file detect-engine-mpm.c.

Referenced by RetrieveFPForSig(), and SCParseCommandLine().