4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Joachim Kaeber <jkaeber@berlios.de>
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the
20 // Free Software Foundation, Inc.,
21 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 \brief GREPacket public header */
27 #define HH_GREPacket 1
31 #include <senf/Packets/Packets.hh>
32 #include <senf/Packets/DefaultBundle/EthernetPacket.hh>
34 //#include "GREPacket.mpp"
35 ///////////////////////////////hh.p////////////////////////////////////////
39 /** \brief Parse a GRE packet
41 Parser implementing the header of a General Routing Encapsulation (GRE, RFC 2784) Packet
45 struct GREChecksumParser : public PacketParserBase {
46 # include SENF_PARSER()
47 SENF_PARSER_FIELD ( checksum1_, UInt16Parser );
48 SENF_PARSER_PRIVATE_FIELD ( reserved1_, UInt16Parser );
49 SENF_PARSER_FINALIZE(GREChecksumParser);
52 struct GREPacketParser : public PacketParserBase
54 # include SENF_PARSER()
56 SENF_PARSER_BITFIELD ( checksum_present, 1, bool );
57 SENF_PARSER_PRIVATE_BITFIELD ( reserved0_, 12, unsigned ); // TODO: SKIP !!
58 SENF_PARSER_BITFIELD ( version_number, 3, unsigned ); // TODO: Always Zero !!
59 SENF_PARSER_FIELD ( protocol_type, UInt16Parser );
60 SENF_PARSER_PRIVATE_VARIANT ( checksum_, checksum_present,
61 (VoidPacketParser) (GREChecksumParser) );
63 SENF_PARSER_FINALIZE( GREPacketParser );
66 UInt16Parser checksum() const /// only defined if checksum_present() == \c true
67 { return checksum_().get<1>().checksum1_(); }
72 \par Packet type (typedef):
77 \image html GREPacket.png
79 \ingroup protocolbundle_mpegdvb
82 : public PacketTypeBase,
83 public PacketTypeMixin<GREPacketType, EtherTypes>
85 typedef PacketTypeMixin<GREPacketType, EtherTypes> mixin;
86 typedef ConcretePacket<GREPacketType> packet;
87 typedef GREPacketParser parser;
89 using mixin::nextPacketRange;
90 using mixin::nextPacketType;
92 using mixin::initSize;
94 static void dump(packet p, std::ostream & os);
95 static EtherTypes::key_t nextPacketKey(packet p) {
96 return p->protocol_type();
98 static void finalize(packet p) {
99 p->protocol_type() << key(p.next(nothrow));
100 p->version_number() = 0; // as per RFC2784, 2.3.1
102 if (p->checksum_present()) {
110 /** \brief GRE packet typedef */
111 typedef GREPacketType::packet GREPacket;
117 ///////////////////////////////hh.e////////////////////////////////////////
118 //#include "TransportPacket.cci"
119 //#include "TransportPacket.ct"
120 //#include "TransportPacket.cti"
127 // c-file-style: "senf"
128 // indent-tabs-mode: nil
129 // ispell-local-dictionary: "american"
130 // compile-command: "scons -u test"
131 // comment-column: 40