612034b43633e87bbe91c2771a81f00e631664fc
[senf.git] / senf / Packets / MPEGDVBBundle / GREPacket.hh
1 // $Id$
2 //
3 // Copyright (C) 2007
4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 //     Joachim Kaeber <jkaeber@berlios.de>
7 //
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.
12 //
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.
17 //
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.
22
23 /** \file
24     \brief GREPacket public header */
25
26 #ifndef HH_SENF_Packets_MPEGDVBBundle_GREPacket_
27 #define HH_SENF_Packets_MPEGDVBBundle_GREPacket_ 1
28
29 // Custom includes
30 #include <senf/Packets/DefaultBundle/EthernetPacket.hh>
31
32 //#include "GREPacket.mpp"
33 //-/////////////////////////////////////////////////////////////////////////////////////////////////
34
35 namespace senf {
36
37     /** \brief Parse a GRE packet
38
39         Parser implementing the header of a General Routing Encapsulation (GRE, RFC 2784) Packet
40
41         \see GREPacketType
42      */
43     struct GREChecksumParser : public PacketParserBase {
44 #       include SENF_PARSER()
45         SENF_PARSER_FIELD ( checksum1_, UInt16Parser );
46         SENF_PARSER_PRIVATE_FIELD ( reserved1_, UInt16Parser );
47         SENF_PARSER_FINALIZE(GREChecksumParser);
48     };
49
50     struct GREPacketParser : public PacketParserBase
51     {
52 #       include SENF_PARSER()
53
54         SENF_PARSER_BITFIELD         ( checksum_present,  1, bool );
55         SENF_PARSER_PRIVATE_BITFIELD ( reserved0_,       12, unsigned ); // TODO: SKIP !!
56         SENF_PARSER_BITFIELD         ( version_number,    3, unsigned ); // TODO: Always Zero !!
57         SENF_PARSER_FIELD            ( protocol_type,    UInt16Parser );
58         SENF_PARSER_PRIVATE_VARIANT  ( checksum_,  checksum_present,
59                                                    (VoidPacketParser) (GREChecksumParser) );
60
61         SENF_PARSER_FINALIZE( GREPacketParser );
62
63       private:
64         UInt16Parser checksum() const /// only defined if checksum_present() == \c true
65              { return checksum_().get<1>().checksum1_(); }
66     };
67
68     /** \brief GRE packet
69
70         \par Packet type (typedef):
71             \ref GREPacket
72
73         \par Fields:
74             \ref GREPacketParser
75             \image html GREPacket.png
76
77         \ingroup protocolbundle_mpegdvb
78      */
79     struct GREPacketType
80         : public PacketTypeBase,
81           public PacketTypeMixin<GREPacketType, EtherTypes>
82     {
83         typedef PacketTypeMixin<GREPacketType, EtherTypes> mixin;
84         typedef ConcretePacket<GREPacketType> packet;
85         typedef GREPacketParser parser;
86
87         using mixin::nextPacketRange;
88         using mixin::nextPacketType;
89         using mixin::init;
90         using mixin::initSize;
91
92         static void dump(packet p, std::ostream & os);
93         static EtherTypes::key_t nextPacketKey(packet p) {
94           return p->protocol_type();
95         }
96         static void finalize(packet p) {
97           p->protocol_type() << key(p.next(nothrow));
98           p->version_number() = 0; // as per RFC2784, 2.3.1
99
100           if (p->checksum_present()) {
101             // compute checksum
102           } else {
103             // ???
104           }
105         }
106     };
107
108     /** \brief GRE packet typedef */
109     typedef GREPacketType::packet GREPacket;
110
111
112 }
113
114
115 //-/////////////////////////////////////////////////////////////////////////////////////////////////
116 //#include "TransportPacket.cci"
117 //#include "TransportPacket.ct"
118 //#include "TransportPacket.cti"
119 #endif
120
121 \f
122 // Local Variables:
123 // mode: c++
124 // fill-column: 100
125 // c-file-style: "senf"
126 // indent-tabs-mode: nil
127 // ispell-local-dictionary: "american"
128 // compile-command: "scons -u test"
129 // comment-column: 40
130 // End: