4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Stefan Bund <g0dil@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 UDPPacket non-inline non-template implementation */
26 #include "UDPPacket.hh"
27 //#include "UDPPacket.ih"
31 #include <boost/io/ios_state.hpp>
32 #include <senf/Packets/Packets.hh>
33 #include <senf/Utils/IpChecksum.hh>
34 #include "IPv4Packet.hh"
35 #include "IPv6Packet.hh"
38 ///////////////////////////////cc.p////////////////////////////////////////
41 SENF_PACKET_REGISTRY_REGISTER( senf::IpTypes, 17, senf::UDPPacket);
44 ///////////////////////////////////////////////////////////////////////////
45 // senf::UDPPacketParser
47 prefix_ boost::uint16_t senf::UDPPacketParser::calcChecksum()
51 // first on to the awkward part: the IP pseudo header
52 IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
54 // Pseudo header defined in RFC768
55 summer.feed( ipv4->source().i(),
56 ipv4->source().i() + IPv4Packet::Parser::source_t::fixed_bytes );
57 ///\fixme What about a hop-by-hop routing option? Which destination is used in IPv4 ?
58 summer.feed( ipv4->destination().i(),
59 ipv4->destination().i() + IPv4PacketParser::destination_t::fixed_bytes );
61 ///\fixme May there be another header between the IPv4 header and UDP? if so, we
62 /// need to hack the correct protocol number here ...
64 summer.feed( i() + length_offset, i() + length_offset + 2 );
67 // Pseudo header defined in RFC2460
68 IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
70 summer.feed( ipv6->source().i(),
71 ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
72 ///\todo Implement routing header support
73 // The destination used here must be the *final* destination ...
74 summer.feed( ipv6->destination().i(),
75 ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
76 // This is a simplification. The value is really 32bit to support UDP Jumbograms
77 // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
78 summer.feed( i() + length_offset, i() + length_offset + 2 );
79 // RFC2460 specifies, that this must always be 17, not the value used in the ipv6
86 // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum
87 // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
88 summer.feed( i(), i()+checksum_offset );
89 summer.feed( i()+checksum_offset+2, data().end() );
91 boost::uint16_t rv (summer.sum());
92 return rv ? rv : 0xffffu;
95 ///////////////////////////////////////////////////////////////////////////
96 // senf::UDPPacketType
98 prefix_ void senf::UDPPacketType::dump(packet p, std::ostream & os)
100 boost::io::ios_all_saver ias(os);
102 << senf::fieldName("source port") << p->source() << "\n"
103 << senf::fieldName("dest port") << p->destination() << "\n"
104 << senf::fieldName("length") << p->length() << "\n"
105 << senf::fieldName("checksum")
106 << "0x" << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n";
109 prefix_ void senf::UDPPacketType::finalize(packet p)
111 p->length() << p.size();
112 p->checksum() << p->calcChecksum();
115 ///////////////////////////////cc.e////////////////////////////////////////
122 // c-file-style: "senf"
123 // indent-tabs-mode: nil
124 // ispell-local-dictionary: "american"
125 // compile-command: "scons -u test"
126 // comment-column: 40