decode-gre.h File Reference

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	GREHdr_
struct	GREPPtPHdr_
struct	GRESreHdr_

Macros
#define	IPPROTO_GRE   47
#define	GRE_VERSION_0   0x0000
#define	GRE_VERSION_1   0x0001
#define	GRE_HDR_LEN   4
#define	GRE_CHKSUM_LEN   2
#define	GRE_OFFSET_LEN   2
#define	GRE_KEY_LEN   4
#define	GRE_SEQ_LEN   4
#define	GRE_SRE_HDR_LEN   4
#define	GRE_PROTO_PPP   0x880b
#define	GRE_FLAG_ISSET_CHKSUM(r)   (r->flags & 0x80)
#define	GRE_FLAG_ISSET_ROUTE(r)   (r->flags & 0x40)
#define	GRE_FLAG_ISSET_KY(r)   (r->flags & 0x20)
#define	GRE_FLAG_ISSET_SQ(r)   (r->flags & 0x10)
#define	GRE_FLAG_ISSET_SSR(r)   (r->flags & 0x08)
#define	GRE_FLAG_ISSET_RECUR(r)   (r->flags & 0x07)
#define	GRE_GET_VERSION(r)   (r->version & 0x07)
#define	GRE_GET_FLAGS(r)   (r->version & 0xF8)
#define	GRE_GET_PROTO(r)   SCNtohs(r->ether_type)
#define	GREV1_HDR_LEN   8
#define	GREV1_ACK_LEN   4
#define	GREV1_FLAG_ISSET_FLAGS(r)   (r->version & 0x78)
#define	GREV1_FLAG_ISSET_ACK(r)   (r->version & 0x80)

Functions
struct GREHdr_	__attribute__ ((__packed__)) GREHdr
	DNP3 link header.
void	DecodeGRERegisterTests (void)
	this function registers unit tests for GRE decoder

Variables
uint8_t	flags
uint8_t	version
uint16_t	ether_type
GREHdr	greh
uint16_t	payload_length
uint16_t	call_id
uint16_t	af
uint8_t	sre_offset
uint8_t	sre_length

Detailed Description

Author

Breno Silva breno.nosp@m..sil.nosp@m.va@gm.nosp@m.ail..nosp@m.com

Generic Route Encapsulation (GRE) from RFC 1701.

Definition in file decode-gre.h.

Macro Definition Documentation

GRE_CHKSUM_LEN

#define GRE_CHKSUM_LEN   2

Definition at line 63 of file decode-gre.h.

GRE_FLAG_ISSET_CHKSUM

#define GRE_FLAG_ISSET_CHKSUM

(

r

)

(r->flags & 0x80)

Definition at line 70 of file decode-gre.h.

GRE_FLAG_ISSET_KY

#define GRE_FLAG_ISSET_KY

(

r

)

(r->flags & 0x20)

Definition at line 72 of file decode-gre.h.

GRE_FLAG_ISSET_RECUR

#define GRE_FLAG_ISSET_RECUR

(

r

)

(r->flags & 0x07)

Definition at line 75 of file decode-gre.h.

GRE_FLAG_ISSET_ROUTE

#define GRE_FLAG_ISSET_ROUTE

(

r

)

(r->flags & 0x40)

Definition at line 71 of file decode-gre.h.

GRE_FLAG_ISSET_SQ

#define GRE_FLAG_ISSET_SQ

(

r

)

(r->flags & 0x10)

Definition at line 73 of file decode-gre.h.

GRE_FLAG_ISSET_SSR

#define GRE_FLAG_ISSET_SSR

(

r

)

(r->flags & 0x08)

Definition at line 74 of file decode-gre.h.

GRE_GET_FLAGS

#define GRE_GET_FLAGS

(

r

)

(r->version & 0xF8)

Definition at line 77 of file decode-gre.h.

GRE_GET_PROTO

#define GRE_GET_PROTO

(

r

)

SCNtohs(r->ether_type)

Definition at line 78 of file decode-gre.h.

GRE_GET_VERSION

#define GRE_GET_VERSION

(

r

)

(r->version & 0x07)

Definition at line 76 of file decode-gre.h.

GRE_HDR_LEN

#define GRE_HDR_LEN   4

Definition at line 62 of file decode-gre.h.

GRE_KEY_LEN

#define GRE_KEY_LEN   4

Definition at line 65 of file decode-gre.h.

GRE_OFFSET_LEN

#define GRE_OFFSET_LEN   2

Definition at line 64 of file decode-gre.h.

GRE_PROTO_PPP

#define GRE_PROTO_PPP   0x880b

Definition at line 68 of file decode-gre.h.

GRE_SEQ_LEN

#define GRE_SEQ_LEN   4

Definition at line 66 of file decode-gre.h.

GRE_SRE_HDR_LEN

#define GRE_SRE_HDR_LEN   4

Definition at line 67 of file decode-gre.h.

GRE_VERSION_0

#define GRE_VERSION_0   0x0000

Definition at line 59 of file decode-gre.h.

GRE_VERSION_1

#define GRE_VERSION_1   0x0001

Definition at line 60 of file decode-gre.h.

GREV1_ACK_LEN

#define GREV1_ACK_LEN   4

Definition at line 81 of file decode-gre.h.

GREV1_FLAG_ISSET_ACK

#define GREV1_FLAG_ISSET_ACK

(

r

)

(r->version & 0x80)

Definition at line 83 of file decode-gre.h.

GREV1_FLAG_ISSET_FLAGS

#define GREV1_FLAG_ISSET_FLAGS

(

r

)

(r->version & 0x78)

Definition at line 82 of file decode-gre.h.

GREV1_HDR_LEN

#define GREV1_HDR_LEN   8

Definition at line 80 of file decode-gre.h.

IPPROTO_GRE

#define IPPROTO_GRE   47

Definition at line 30 of file decode-gre.h.

Function Documentation

DecodeGRERegisterTests()

void DecodeGRERegisterTests

(

void

)

this function registers unit tests for GRE decoder

Definition at line 395 of file decode-gre.c.

References UtRegisterTest().

Here is the call graph for this function:

Variable Documentation

af

uint16_t af

Address family

Definition at line 0 of file decode-gre.h.

Referenced by Defrag(), and PrintInet().

call_id

uint16_t call_id

PPP payload length

Definition at line 2 of file decode-gre.h.

ether_type

uint16_t ether_type

ether type of the encapsulated traffic

Definition at line 2 of file decode-gre.h.

flags

uint8_t flags

GRE packet flags

Definition at line 0 of file decode-gre.h.

Referenced by __attribute__(), AlertJsonHeader(), AppLayerExpectationHandle(), AppLayerHandleTCPData(), AppLayerHandleUdp(), AppLayerParserGetStateProgress(), AppLayerParserParse(), AppLayerParserRegisterOptionFlags(), AppLayerParserSetStreamDepthFlag(), AppLayerParserSetTransactionInspectId(), AppLayerProtoDetectGetProto(), DetectBytejumpDoMatch(), DetectBytetestDoMatch(), DetectEngineContentInspection(), DetectEngineInspectBufferGeneric(), DetectEngineInspectBufferSingle(), DetectEngineInspectFiledata(), DetectEngineInspectGenericList(), DetectEngineInspectMultiBufferGeneric(), DetectEngineInspectStream(), DetectFileInspectGeneric(), DetectFlowSetupImplicit(), EveFileInfo(), EveTcpFlags(), FileCloseFile(), FileCloseFileById(), FileCloseFilePtr(), FileFlowFlagsToFlags(), FileOpenFileWithId(), FlowGetDisruptionFlags(), HTPFileClose(), HTPFileCloseHandleRange(), HTPFileOpen(), HTPFileOpenWithRange(), HttpRangeClose(), HttpRangeContainerOpenFile(), LLVMFuzzerTestOneInput(), LogTcpDataLogger(), LuaExtensionsMatchSetup(), MpmAddPattern(), MpmAddPatternCI(), MpmAddPatternCS(), Prefilter(), SCACAddPatternCI(), SCACAddPatternCS(), SCACTileAddPatternCI(), SCACTileAddPatternCS(), SCDetectHelperKeywordRegister(), SCProfilingPrintPacketProfile(), SigMatchStrictEnabled(), StatsToJSON(), StreamTcpPruneSession(), TmThreadsListThreads(), and TmThreadWaitForFlag().

greh

GREHdr greh

Definition at line 0 of file decode-gre.h.

Referenced by DecodeGRE().

payload_length

uint16_t payload_length

base GRE packet header

Definition at line 1 of file decode-gre.h.

sre_length

uint8_t sre_length

Definition at line 2 of file decode-gre.h.

sre_offset

uint8_t sre_offset

Definition at line 1 of file decode-gre.h.

version

uint8_t version

GRE version

Definition at line 1 of file decode-gre.h.

Referenced by DecodeERSPAN(), DecodeNSH(), and DetectEngineGetVersion().