udp-protocol.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "udp-protocol.hpp"

namespace nfd {
namespace udp {

ssize_t
computeMtu(const boost::asio::ip::udp::endpoint& localEndpoint)
{
  size_t mtu = 0;
  if (localEndpoint.address().is_v4()) { // IPv4
    mtu = std::numeric_limits<uint16_t>::max(); // maximum Total Length
    mtu -= sizeof(uint32_t) * ((1 << 4) - 1); // maximum Internet Header Length
  }
  else { // IPv6
    mtu = std::numeric_limits<uint16_t>::max(); // maximum Payload Length
  }
  mtu -= sizeof(uint16_t) * 4; // size of UDP header
  return mtu;
}

} // namespace udp
} // namespace nfd