text: // Copyright (c) 2017, Cloudigo.
  // Copyright (c) 2017, Nefeli Networks, Inc.
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  //
  // * Redistributions of source code must retain the above copyright notice, this
  // list of conditions and the following disclaimer.
  //
  // * Redistributions in binary form must reproduce the above copyright notice,
  // this list of conditions and the following disclaimer in the documentation
  // and/or other materials provided with the distribution.
  //
  // * Neither the names of the copyright holders nor the names of their
  // contributors may be used to endorse or promote products derived from this
  // software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  
  #ifndef BESS_MODULES_MPLSPOP_H_
  #define BESS_MODULES_MPLSPOP_H_
  
  #include "../module.h"
  #include "../pb/module_msg.pb.h"
  #include "../utils/ether.h"
  
  using bess::utils::be16_t;
  
  class MPLSPop final : public Module {
   public:
    static const gate_idx_t kNumIGates = 1;
    static const gate_idx_t kNumOGates = 2;
  
    static const Commands cmds;
  
    MPLSPop();  // constructor
  
    void ProcessBatch(Context *ctx, bess::PacketBatch *batch) override;
  
    CommandResponse CommandSet(const bess::pb::MplsPopArg &arg);
  
   private:
    be16_t next_ether_type_;
    bool remove_eth_header_;
  };
  
  #endif  // BESS_MODULES_MPLSPOP_H_
  