// Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-// Definition of non-inline non-template functions
+/** \file
+ \brief UDPPacket non-inline non-template implementation */
#include "UDPPacket.hh"
//#include "UDPPacket.ih"
#include "IpV4Packet.hh"
// Custom includes
-#include "Packets/DataPacket.hh"
+#include <iomanip>
+#include <boost/io/ios_state.hpp>
+#include "../../Packets/Packets.hh"
+#include "../../Utils/IpChecksum.hh"
+#include "IpV4Packet.hh"
+#include "IpV6Packet.hh"
#define prefix_
///////////////////////////////cc.p////////////////////////////////////////
namespace {
- senf::PacketRegistry<senf::IpTypes>::RegistrationProxy<senf::UDPPacketType>
+ senf::PacketRegistry<senf::IpTypes>::RegistrationProxy<senf::UDPPacket>
registerUDPPacket (17);
}
+///////////////////////////////////////////////////////////////////////////
+// senf::Parse_UDP
+
+prefix_ boost::uint16_t senf::Parse_UDP::calcChecksum()
+ const
+{
+ IpChecksum summer;
+ summer.feed( i(), i()+checksum_offset );
+ summer.feed( i()+checksum_offset+2, data().end() );
+
+ // Now on to the awkward part: the IP pseudo header
+ IpV4Packet ipv4 (packet().prev<IpV4Packet>(nothrow));
+ if (ipv4) {
+ // Pseudo header defined in RFC768
+ summer.feed( ipv4->source().i(),
+ ipv4->source().i() + Parse_IpV4::source_t::fixed_bytes );
+ ///\fixme What about a hop-by-hop routing option? Which destination is used in IpV4 ?
+ summer.feed( ipv4->destination().i(),
+ ipv4->destination().i() + Parse_IpV4::destination_t::fixed_bytes );
+ summer.feed( 0u );
+ ///\fixme May there be another header between the IpV4 header and UDP? if so, we
+ /// need to hack the correct protocol number here ...
+ summer.feed( 17u );
+ summer.feed( i() + length_offset, i() + length_offset + 2 );
+ }
+ else {
+ // Pseudo header defined in RFC2460
+ IpV6Packet ipv6 (packet().prev<IpV6Packet>(nothrow));
+ if (ipv6) {
+ summer.feed( ipv6->source().i(),
+ ipv6->source().i() + Parse_IpV6::source_t::fixed_bytes );
+ ///\todo Implement routing header support
+ // The destination used here must be the *final* destination ...
+ summer.feed( ipv6->destination().i(),
+ ipv6->destination().i() + Parse_IpV6::destination_t::fixed_bytes );
+ /// This is a simplification. The value is really 32bit to support UDP Jumbograms
+ /// (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
+ summer.feed( i() + length_offset, i() + length_offset + 2 );
+ // RFC2460 specifies, that this must always be 17, not the value used in the ipv6
+ // header
+ summer.feed( 0u );
+ summer.feed( 17u );
+ }
+ }
+
+ boost::uint16_t rv (summer.sum());
+ return rv ? rv : 0xffffu;
+}
+
+///////////////////////////////////////////////////////////////////////////
+// senf::UDPPacketType
+
prefix_ void senf::UDPPacketType::dump(packet p, std::ostream & os)
{
+ boost::io::ios_all_saver ias(os);
os << "UDP:\n"
<< " source port : " << p->source() << "\n"
<< " dest port : " << p->destination() << "\n"
<< " length : " << p->length() << "\n"
- << " crc : " << std::hex << p->crc() << std::dec << "\n";
+ << " checksum : "
+ << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n";
+}
+
+prefix_ void senf::UDPPacketType::finalize(packet p)
+{
+ p->length() << p.size();
+ p->checksum() << p->calcChecksum();
}
///////////////////////////////cc.e////////////////////////////////////////