Davide Pesavento
63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2014-2018, Regents of the University of California,
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* Arizona Board of Regents,
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* Colorado State University,
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* University Pierre & Marie Curie, Sorbonne University,
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* Washington University in St. Louis,
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* Beijing Institute of Technology,
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* The University of Memphis.
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*
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* This file is part of NFD (Named Data Networking Forwarding Daemon).
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* See AUTHORS.md for complete list of NFD authors and contributors.
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*
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* NFD is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ethernet-protocol.hpp"
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#include <boost/endian/conversion.hpp>
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namespace nfd {
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namespace ethernet {
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std::pair<const ether_header*, std::string>
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checkFrameHeader(const uint8_t* packet, size_t length,
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const Address& localAddr, const Address& destAddr)
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{
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if (length < HDR_LEN + MIN_DATA_LEN)
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return {nullptr, "Received frame too short: " + to_string(length) + " bytes"};
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const ether_header* eh = reinterpret_cast<const ether_header*>(packet);
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// in some cases VLAN-tagged frames may survive the BPF filter,
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// make sure we do not process those frames (see #3348)
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uint16_t ethertype = boost::endian::big_to_native(eh->ether_type);
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if (ethertype != ETHERTYPE_NDN)
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return {nullptr, "Received frame with wrong ethertype: " + to_string(ethertype)};
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#ifdef _DEBUG
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Address shost(eh->ether_shost);
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if (shost == localAddr)
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return {nullptr, "Received frame sent by this host"};
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Address dhost(eh->ether_dhost);
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if (dhost != destAddr)
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return {nullptr, "Received frame addressed to another host or multicast group: " + dhost.toString()};
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#endif
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return {eh, ""};
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}
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} // namespace ethernet
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} // namespace nfd
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