// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
/*
 * This file is open source software, licensed to you under the terms
 * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership.  You may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/*
 * Copyright (C) 2014 Cloudius Systems, Ltd.
 */

#include "ARP.h"

arp_for_protocol::arp_for_protocol(arp& a, uint16_t proto_num)
    : _arp(a), _proto_num(proto_num)
{
  _arp.add(proto_num, this);
}

arp_for_protocol::~arp_for_protocol()
{
  _arp.del(_proto_num);
}

arp::arp(interface* netif):
    _netif(netif),
    _proto(netif, eth_protocol_num::arp, [this] { return get_packet(); }),
    _rx_packets(
        _proto.receive(
            [this] (Packet p, ethernet_address ea) {
              return process_packet(std::move(p), ea);
            },
            [this](forward_hash& out_hash_data, Packet& p, size_t off) {
              return forward(out_hash_data, p, off);
            }
        )
    )
{}

std::optional<l3_protocol::l3packet> arp::get_packet()
{
  std::optional<l3_protocol::l3packet> p;
  if (!_packetq.empty()) {
    p = std::move(_packetq.front());
    _packetq.pop_front();
  }
  return p;
}

bool arp::forward(forward_hash& out_hash_data, Packet& p, size_t off)
{
  auto ah = p.get_header<arp_hdr>(off);
  auto i = _arp_for_protocol.find(ntoh(ah->ptype));
  if (i != _arp_for_protocol.end()) {
    return i->second->forward(out_hash_data, p, off);
  }
  return false;
}

void arp::add(uint16_t proto_num, arp_for_protocol* afp)
{
  _arp_for_protocol[proto_num] = afp;
}

void arp::del(uint16_t proto_num)
{
  _arp_for_protocol.erase(proto_num);
}

int arp::process_packet(Packet p, ethernet_address from)
{
  auto ah = p.get_header<arp_hdr>()->ntoh();
  auto i = _arp_for_protocol.find(ah.ptype);
  if (i != _arp_for_protocol.end()) {
    i->second->received(std::move(p));
  }
  return 0;
}
