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_PACKET_REGISTRY_REGISTER( senf::IpTypes, 6, senf::TCPPacket);
44 ///////////////////////////////////////////////////////////////////////////
45 // senf::TCPPacketParser
47 prefix_ boost::uint16_t senf::TCPPacketParser::calcChecksum()
51 // first on to the awkward part: the IP pseudo header
52 IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
54 // Pseudo header defined in RFC793
56 summer.feed( ipv4->source().i(),
57 ipv4->source().i() + IPv4Packet::Parser::source_t::fixed_bytes );
58 ///\fixme What about a hop-by-hop routing option? Which destination is used in IPv4 ?
59 summer.feed( ipv4->destination().i(),
60 ipv4->destination().i() + IPv4PacketParser::destination_t::fixed_bytes );
63 ///\fixme May there be another header between the IPv4 header and TCP? if so, we
64 /// need to hack the correct protocol number here ...
67 // feed 1st byte and 2nd byte from field tcp length
68 summer.feed(boost::uint16_t(data().size()) & 0xff00);
69 summer.feed(boost::uint16_t(data().size()) & 0x00ff);
73 // Pseudo header defined in RFC2460
74 IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
76 summer.feed( ipv6->source().i(),
77 ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
78 ///\todo Implement routing header support
79 // The destination used here must be the *final* destination ...
80 summer.feed( ipv6->destination().i(),
81 ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
82 // This is a simplification. The value is really 32bit to support UDP Jumbograms
83 // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
84 // RFC2460 specifies, that this must always be 6, not the value used in the ipv6
86 // feed 1st byte and 2nd byte from field tcp length
87 summer.feed(boost::uint16_t(data().size()) & 0xff00);
88 summer.feed(boost::uint16_t(data().size()) & 0x00ff);
91 // add TCP protocol number
96 // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum
97 // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
99 // iterate till checksum field and skip 2 bytes,
100 // iterate over rest of tcp header and tcp payload
101 summer.feed( i(), i()+16 );
102 summer.feed( i()+18, data().end() );
104 boost::uint16_t rv (summer.sum());
105 return rv ? rv : 0xffffu;
109 ///////////////////////////////////////////////////////////////////////////
110 // senf::TCPPacketType
112 prefix_ void senf::TCPPacketType::dump(packet p, std::ostream & os)
114 boost::io::ios_all_saver ias(os);
116 << senf::fieldName("source port") << p->source() << "\n"
117 << senf::fieldName("destination port") << p->destination() << "\n"
118 << senf::fieldName("sequence number") << p->sequencenumber() << "\n"
119 << senf::fieldName("acknowledgment number") << p->acknowledgmentnumber() << "\n"
120 << senf::fieldName("data offset") << p->dataoffset() << "\n"
121 << senf::fieldName("urgent flag") << p->urgf() << "\n"
122 << senf::fieldName("ack flag") << p->ackf() << "\n"
123 << senf::fieldName("push flag") << p->pshf() << "\n"
124 << senf::fieldName("reset flag") << p->rstf() << "\n"
125 << senf::fieldName("syn flag") << p->synf() << "\n"
126 << senf::fieldName("fin flag") << p->finf() << "\n"
127 << senf::fieldName("window size") << p->window() << "\n"
128 << senf::fieldName("checksum")
129 << "0x" << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n"
130 << senf::fieldName("urgent pointer") << p->urgentpointer() << "\n";
133 prefix_ void senf::TCPPacketType::finalize(packet p)
135 p->dataoffset() << p.size();
136 p->checksum() << p->calcChecksum();
139 ///////////////////////////////cc.e////////////////////////////////////////
146 // c-file-style: "senf"
147 // indent-tabs-mode: nil
148 // ispell-local-dictionary: "american"
149 // compile-command: "scons -u test"
150 // comment-column: 40