decode-gre.h File Reference

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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. More...
void	DecodeGRERegisterTests (void)
	this function registers unit tests for GRE decoder More...

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 64 of file decode-gre.h.

GRE_FLAG_ISSET_CHKSUM

#define GRE_FLAG_ISSET_CHKSUM

(

r

)

(r->flags & 0x80)

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

GRE_FLAG_ISSET_KY

#define GRE_FLAG_ISSET_KY

(

r

)

(r->flags & 0x20)

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

GRE_FLAG_ISSET_RECUR

#define GRE_FLAG_ISSET_RECUR

(

r

)

(r->flags & 0x07)

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

GRE_FLAG_ISSET_ROUTE

#define GRE_FLAG_ISSET_ROUTE

(

r

)

(r->flags & 0x40)

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

GRE_FLAG_ISSET_SQ

#define GRE_FLAG_ISSET_SQ

(

r

)

(r->flags & 0x10)

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

GRE_FLAG_ISSET_SSR

#define GRE_FLAG_ISSET_SSR

(

r

)

(r->flags & 0x08)

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

GRE_GET_FLAGS

#define GRE_GET_FLAGS

(

r

)

(r->version & 0xF8)

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

GRE_GET_PROTO

#define GRE_GET_PROTO

(

r

)

SCNtohs(r->ether_type)

Definition at line 79 of file decode-gre.h.

GRE_GET_VERSION

#define GRE_GET_VERSION

(

r

)

(r->version & 0x07)

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

GRE_HDR_LEN

#define GRE_HDR_LEN   4

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

GRE_KEY_LEN

#define GRE_KEY_LEN   4

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

GRE_OFFSET_LEN

#define GRE_OFFSET_LEN   2

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

GRE_PROTO_PPP

#define GRE_PROTO_PPP   0x880b

Definition at line 69 of file decode-gre.h.

GRE_SEQ_LEN

#define GRE_SEQ_LEN   4

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

GRE_SRE_HDR_LEN

#define GRE_SRE_HDR_LEN   4

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

GRE_VERSION_0

#define GRE_VERSION_0   0x0000

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

GRE_VERSION_1

#define GRE_VERSION_1   0x0001

Definition at line 61 of file decode-gre.h.

GREV1_ACK_LEN

#define GREV1_ACK_LEN   4

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

GREV1_FLAG_ISSET_ACK

#define GREV1_FLAG_ISSET_ACK

(

r

)

(r->version & 0x80)

Definition at line 84 of file decode-gre.h.

GREV1_FLAG_ISSET_FLAGS

#define GREV1_FLAG_ISSET_FLAGS

(

r

)

(r->version & 0x78)

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

GREV1_HDR_LEN

#define GREV1_HDR_LEN   8

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

IPPROTO_GRE

#define IPPROTO_GRE   47

Definition at line 31 of file decode-gre.h.

Function Documentation

DecodeGRERegisterTests()

void DecodeGRERegisterTests

(

void

)

this function registers unit tests for GRE decoder

Definition at line 391 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 AppLayerHandleTCPData(), AppLayerHandleUdp(), AppLayerParserGetStateProgress(), AppLayerParserSetTransactionInspectId(), AppLayerProtoDetectGetProto(), DetectEngineInspectBufferGeneric(), DetectEngineInspectFiledata(), DetectEngineInspectGenericList(), DetectFileInspectGeneric(), DetectFlowSetupImplicit(), EveFileInfo(), EveTcpFlags(), FileFlowFlagsToFlags(), FlowGetDisruptionFlags(), HTPFileClose(), HTPFileOpen(), HTPFileOpenWithRange(), LLVMFuzzerTestOneInput(), MpmAddPattern(), MpmAddPatternCI(), MpmAddPatternCS(), Prefilter(), SCACAddPatternCI(), SCACAddPatternCS(), SCACTileAddPatternCI(), SCACTileAddPatternCS(), SCHTPGenerateNormalizedUri(), SigMatchStrictEnabled(), SigTableList(), SMTPProcessDataChunk(), StatsToJSON(), StreamTcpPruneSession(), TmThreadCountThreadsByTmmFlags(), and TmThreadWaitForFlag().

greh

GREHdr greh

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

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 DetectEngineGetVersion(), ReceivePfringThreadInit(), and SSLVersionToString().