4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Dennis Goslar <dennis.goslar@inf.hochschule-bonn-rhein-sieg.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 TCPPacket non-inline non-template implementation */
26 #include "TCPPacket.hh"
27 //#include "TCPPacket.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::PacketRegistry<senf::IpTypes>::RegistrationProxy<senf::TCPPacket>
42 registerTCPPacket (6);
45 ///////////////////////////////////////////////////////////////////////////
46 // senf::TCPPacketParser
48 prefix_ boost::uint16_t senf::TCPPacketParser::calcChecksum()
52 // first on to the awkward part: the IP pseudo header
53 IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
55 // Pseudo header defined in RFC793
57 summer.feed( ipv4->source().i(),
58 ipv4->source().i() + IPv4Packet::Parser::source_t::fixed_bytes );
59 ///\fixme What about a hop-by-hop routing option? Which destination is used in IPv4 ?
60 summer.feed( ipv4->destination().i(),
61 ipv4->destination().i() + IPv4PacketParser::destination_t::fixed_bytes );
64 ///\fixme May there be another header between the IPv4 header and TCP? if so, we
65 /// need to hack the correct protocol number here ...
68 // feed 1st byte and 2nd byte from field tcp length
69 summer.feed(boost::uint16_t(data().size()) & 0xff00);
70 summer.feed(boost::uint16_t(data().size()) & 0x00ff);
74 // Pseudo header defined in RFC2460
75 IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
77 summer.feed( ipv6->source().i(),
78 ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
79 ///\todo Implement routing header support
80 // The destination used here must be the *final* destination ...
81 summer.feed( ipv6->destination().i(),
82 ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
83 // This is a simplification. The value is really 32bit to support UDP Jumbograms
84 // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
85 // RFC2460 specifies, that this must always be 6, not the value used in the ipv6
87 // feed 1st byte and 2nd byte from field tcp length
88 summer.feed(boost::uint16_t(data().size()) & 0xff00);
89 summer.feed(boost::uint16_t(data().size()) & 0x00ff);
92 // add TCP protocol number
97 // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum
98 // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
100 // iterate till checksum field and skip 2 bytes,
101 // iterate over rest of tcp header and tcp payload
102 summer.feed( i(), i()+16 );
103 summer.feed( i()+18, data().end() );
105 boost::uint16_t rv (summer.sum());
106 return rv ? rv : 0xffffu;
110 ///////////////////////////////////////////////////////////////////////////
111 // senf::TCPPacketType
113 prefix_ void senf::TCPPacketType::dump(packet p, std::ostream & os)
115 boost::io::ios_all_saver ias(os);
117 << " source port : " << p->source() << "\n"
118 << " destination port : " << p->destination() << "\n"
119 << " sequence number : " << p->sequencenumber() << "\n"
120 << " acknowledgment number : " << p->acknowledgmentnumber() << "\n"
121 << " data offset : " << p->dataoffset() << "\n"
122 << " urgent flag : " << p->urgf() << "\n"
123 << " ack flag : " << p->ackf() << "\n"
124 << " push flag : " << p->pshf() << "\n"
125 << " reset flag : " << p->rstf() << "\n"
126 << " syn flag : " << p->synf() << "\n"
127 << " fin flag : " << p->finf() << "\n"
128 << " window size : " << p->window() << "\n"
130 << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n"
131 << " urgent pointer : " << p->urgentpointer() << "\n";
134 prefix_ void senf::TCPPacketType::finalize(packet p)
136 p->dataoffset() << p.size();
137 p->checksum() << p->calcChecksum();
140 ///////////////////////////////cc.e////////////////////////////////////////
147 // c-file-style: "senf"
148 // indent-tabs-mode: nil
149 // ispell-local-dictionary: "american"
150 // compile-command: "scons -u test"
151 // comment-column: 40