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62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/** Copyright (c) 2009 Open Information Security Foundation
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*
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* \author Breno Silva <breno.silva@gmail.com>
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*/
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#ifndef __DECODE_GRE_H__
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#define __DECODE_GRE_H__
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#ifndef IPPROTO_GRE
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#define IPPROTO_GRE 47
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#endif
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#include "decode.h"
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#include "threadvars.h"
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typedef struct GREHdr_
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{
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uint8_t flags; /**< GRE packet flags */
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uint8_t version; /**< GRE version */
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uint16_t ether_type; /**< ether type of the encapsulated traffic */
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} GREHdr;
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typedef struct GRESreHdr_
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{
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uint16_t af; /**< Address family */
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uint8_t sre_offset;
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uint8_t sre_length;
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uint8_t *routing;
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} GRESreHdr;
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#define GRE_VERSION_0 0x0000
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#define GRE_VERSION_1 0x0001
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#define GRE_HDR_LEN 4
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#define GRE_CHKSUM_LEN 2
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#define GRE_OFFSET_LEN 2
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#define GRE_KEY_LEN 4
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#define GRE_SEQ_LEN 4
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#define GRE_SRE_HDR_LEN 4
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#define GRE_PROTO_PPP 0x880b
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#define GRE_FLAG_ISSET_CHKSUM(r) (r->flags & 0x80)
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#define GRE_FLAG_ISSET_ROUTE(r) (r->flags & 0x40)
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#define GRE_FLAG_ISSET_KY(r) (r->flags & 0x20)
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#define GRE_FLAG_ISSET_SQ(r) (r->flags & 0x10)
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#define GRE_FLAG_ISSET_SSR(r) (r->flags & 0x08)
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#define GRE_FLAG_ISSET_RECUR(r) (r->flags & 0x07)
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#define GRE_GET_VERSION(r) (r->version & 0x07)
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#define GRE_GET_FLAGS(r) (r->version & 0xF8)
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#define GRE_GET_PROTO(r) ntohs(r->ether_type)
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#define GREV1_HDR_LEN 8
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#define GREV1_ACK_LEN 4
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#define GREV1_FLAG_ISSET_FLAGS(r) (r->version & 0x78)
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#define GREV1_FLAG_ISSET_ACK(r) (r->version & 0x80)
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void DecodeGRERegisterTests(void);
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#endif /* __DECODE_GRE_H__ */
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