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88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/* Copyright (C) 2007-2010 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file decode-gre.h
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*
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* \author Breno Silva <breno.silva@gmail.com>
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*
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* Generic Route Encapsulation (GRE) from RFC 1701.
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*/
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#ifndef SURICATA_DECODE_GRE_H
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#define SURICATA_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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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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} __attribute__((__packed__)) GREHdr;
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/* Enhanced GRE header - https://tools.ietf.org/html/rfc2637#section-4.1 */
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typedef struct GREPPtPHdr_ {
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GREHdr greh; /** base GRE packet header */
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uint16_t payload_length; /** PPP payload length */
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uint16_t call_id; /** PPP peer id */
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} __attribute__((__packed__)) GREPPtPHd;
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/* Generic Routing Encapsulation Source Route Entries (SREs).
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* The header is followed by a variable amount of Routing Information.
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*/
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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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} __attribute__((__packed__)) 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) SCNtohs(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 /* SURICATA_DECODE_GRE_H */
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