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/Utils/IpChecksum.hh>
33 #include "IPv6Packet.hh"
36 //-/////////////////////////////////////////////////////////////////////////////////////////////////
39 SENF_PACKET_REGISTRY_REGISTER( senf::IpTypes, 6, senf::TCPPacket);
42 //-/////////////////////////////////////////////////////////////////////////////////////////////////
43 // senf::TCPPacketParser
45 prefix_ boost::uint16_t senf::TCPPacketParser::calcChecksum()
49 // first on to the awkward part: the IP pseudo header
50 IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
52 // Pseudo header defined in RFC793
54 summer.feed( ipv4->source().i(),
55 ipv4->source().i() + IPv4Packet::Parser::source_t::fixed_bytes );
56 ///\fixme What about a hop-by-hop routing option? Which destination is used in IPv4 ?
57 summer.feed( ipv4->destination().i(),
58 ipv4->destination().i() + IPv4PacketParser::destination_t::fixed_bytes );
61 ///\fixme May there be another header between the IPv4 header and TCP? if so, we
62 /// need to hack the correct protocol number here ...
65 // feed 1st byte and 2nd byte from field tcp length
66 summer.feed(boost::uint16_t(data().size()) & 0xff00);
67 summer.feed(boost::uint16_t(data().size()) & 0x00ff);
71 // Pseudo header defined in RFC2460
72 IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
74 summer.feed( ipv6->source().i(),
75 ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
76 ///\todo Implement routing header support
77 // The destination used here must be the *final* destination ...
78 summer.feed( ipv6->destination().i(),
79 ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
80 // This is a simplification. The value is really 32bit to support UDP Jumbograms
81 // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
82 // RFC2460 specifies, that this must always be 6, not the value used in the ipv6
84 // feed 1st byte and 2nd byte from field tcp length
85 summer.feed(boost::uint16_t(data().size()) & 0xff00);
86 summer.feed(boost::uint16_t(data().size()) & 0x00ff);
89 // add TCP protocol number
94 // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum
95 // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
97 // iterate till checksum field and skip 2 bytes,
98 // iterate over rest of tcp header and tcp payload
99 summer.feed( i(), i()+16 );
100 summer.feed( i()+18, data().end() );
102 boost::uint16_t rv (summer.sum());
103 return rv ? rv : 0xffffu;
107 //-/////////////////////////////////////////////////////////////////////////////////////////////////
108 // senf::TCPPacketType
110 prefix_ void senf::TCPPacketType::dump(packet p, std::ostream & os)
112 boost::io::ios_all_saver ias(os);
114 << senf::fieldName("source port") << p->source() << "\n"
115 << senf::fieldName("destination port") << p->destination() << "\n"
116 << senf::fieldName("sequence number") << p->sequencenumber() << "\n"
117 << senf::fieldName("acknowledgment number") << p->acknowledgmentnumber() << "\n"
118 << senf::fieldName("data offset") << p->dataoffset() << "\n"
119 << senf::fieldName("urgent flag") << p->urgf() << "\n"
120 << senf::fieldName("ack flag") << p->ackf() << "\n"
121 << senf::fieldName("push flag") << p->pshf() << "\n"
122 << senf::fieldName("reset flag") << p->rstf() << "\n"
123 << senf::fieldName("syn flag") << p->synf() << "\n"
124 << senf::fieldName("fin flag") << p->finf() << "\n"
125 << senf::fieldName("window size") << p->window() << "\n"
126 << senf::fieldName("checksum")
127 << "0x" << std::hex << std::setw(4) << std::setfill('0') << std::right << p->checksum() << "\n"
128 << senf::fieldName("urgent pointer") << p->urgentpointer() << "\n";
131 prefix_ void senf::TCPPacketType::finalize(packet p)
133 p->dataoffset() << p.size();
134 p->checksum() << p->calcChecksum();
137 //-/////////////////////////////////////////////////////////////////////////////////////////////////
144 // c-file-style: "senf"
145 // indent-tabs-mode: nil
146 // ispell-local-dictionary: "american"
147 // compile-command: "scons -u test"
148 // comment-column: 40