/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/types.h>

#include "ipv4-raw-socket-impl.h"

#include "ipv4-l3-protocol.h"

#include "icmpv4.h"

#include "ns3/ipv4-packet-info-tag.h"

#include "ns3/inet-socket-address.h"

#include "ns3/node.h"

#include "ns3/packet.h"

#include "ns3/uinteger.h"

#include "ns3/boolean.h"

#include "ns3/log.h"

NS_LOG_COMPONENT_DEFINE ("Ipv4RawSocketImpl");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (Ipv4RawSocketImpl)

  ;

TypeId 

Ipv4RawSocketImpl::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::Ipv4RawSocketImpl")

    .SetParent<Socket> ()

    .AddAttribute ("Protocol", "Protocol number to match.",

                   UintegerValue (0),

                   MakeUintegerAccessor (&Ipv4RawSocketImpl::m_protocol),

                   MakeUintegerChecker<uint16_t> ())

    .AddAttribute ("IcmpFilter", 

                   "Any icmp header whose type field matches a bit in this filter is dropped. Type must be less than 32.",

                   UintegerValue (0),

                   MakeUintegerAccessor (&Ipv4RawSocketImpl::m_icmpFilter),

                   MakeUintegerChecker<uint32_t> ())

    // 

    //  from raw (7), linux, returned length of Send/Recv should be

    // 

    //            | IP_HDRINC on  |      off    |

    //  ----------+---------------+-------------+-

    //  Send(Ipv4)| hdr + payload | payload     |

    //  Recv(Ipv4)| hdr + payload | hdr+payload |

    //  ----------+---------------+-------------+-

    .AddAttribute ("IpHeaderInclude", 

                   "Include IP Header information (a.k.a setsockopt (IP_HDRINCL)).",

                   BooleanValue (false),

                   MakeBooleanAccessor (&Ipv4RawSocketImpl::m_iphdrincl),

                   MakeBooleanChecker ())

  ;

  return tid;

}

Ipv4RawSocketImpl::Ipv4RawSocketImpl ()

{

  NS_LOG_FUNCTION (this);

  m_err = Socket::ERROR_NOTERROR;

  m_node = 0;

  m_src = Ipv4Address::GetAny ();

  m_dst = Ipv4Address::GetAny ();

  m_protocol = 0;

  m_shutdownSend = false;

  m_shutdownRecv = false;

}

void 

Ipv4RawSocketImpl::SetNode (Ptr<Node> node)

{

  NS_LOG_FUNCTION (this << node);

  m_node = node;

}

void

Ipv4RawSocketImpl::DoDispose (void)

{

  NS_LOG_FUNCTION (this);

  m_node = 0;

  Socket::DoDispose ();

}

enum Socket::SocketErrno 

Ipv4RawSocketImpl::GetErrno (void) const

{

  NS_LOG_FUNCTION (this);

  return m_err;

}

enum Socket::SocketType

Ipv4RawSocketImpl::GetSocketType (void) const

{

  NS_LOG_FUNCTION (this);

  return NS3_SOCK_RAW;

}

Ptr<Node> 

Ipv4RawSocketImpl::GetNode (void) const

{

  NS_LOG_FUNCTION (this);

  return m_node;

}

int 

Ipv4RawSocketImpl::Bind (const Address &address)

{

  NS_LOG_FUNCTION (this << address);

  if (!InetSocketAddress::IsMatchingType (address))

    {

      m_err = Socket::ERROR_INVAL;

      return -1;

    }

  InetSocketAddress ad = InetSocketAddress::ConvertFrom (address);

  m_src = ad.GetIpv4 ();

  return 0;

}

int 

Ipv4RawSocketImpl::Bind (void)

{

  NS_LOG_FUNCTION (this);

  m_src = Ipv4Address::GetAny ();

  return 0;

}

int 

Ipv4RawSocketImpl::Bind6 (void)

{

  NS_LOG_FUNCTION (this);

  return (-1);

}

int 

Ipv4RawSocketImpl::GetSockName (Address &address) const

{

  NS_LOG_FUNCTION (this << address);

  address = InetSocketAddress (m_src, 0);

  return 0;

}

int 

Ipv4RawSocketImpl::Close (void)

{

  NS_LOG_FUNCTION (this);

  Ptr<Ipv4> ipv4 = m_node->GetObject<Ipv4> ();

  if (ipv4 != 0)

    {

      ipv4->DeleteRawSocket (this);

    }

  return 0;

}

int 

Ipv4RawSocketImpl::ShutdownSend (void)

{

  NS_LOG_FUNCTION (this);

  m_shutdownSend = true;

  return 0;

}

int 

Ipv4RawSocketImpl::ShutdownRecv (void)

{

  NS_LOG_FUNCTION (this);

  m_shutdownRecv = true;

  return 0;

}

int 

Ipv4RawSocketImpl::Connect (const Address &address)

{

  NS_LOG_FUNCTION (this << address);

  if (!InetSocketAddress::IsMatchingType (address))

    {

      m_err = Socket::ERROR_INVAL;

      return -1;

    }

  InetSocketAddress ad = InetSocketAddress::ConvertFrom (address);

  m_dst = ad.GetIpv4 ();

  return 0;

}

int 

Ipv4RawSocketImpl::Listen (void)

{

  NS_LOG_FUNCTION (this);

  m_err = Socket::ERROR_OPNOTSUPP;

  return -1;

}

uint32_t 

Ipv4RawSocketImpl::GetTxAvailable (void) const

{

  NS_LOG_FUNCTION (this);

  return 0xffffffff;

}

int 

Ipv4RawSocketImpl::Send (Ptr<Packet> p, uint32_t flags)

{

  NS_LOG_FUNCTION (this << p << flags);

  InetSocketAddress to = InetSocketAddress (m_dst, m_protocol);

  return SendTo (p, flags, to);

}

int 

Ipv4RawSocketImpl::SendTo (Ptr<Packet> p, uint32_t flags, 

                           const Address &toAddress)

{

  NS_LOG_FUNCTION (this << p << flags << toAddress);

  if (!InetSocketAddress::IsMatchingType (toAddress))

    {

      m_err = Socket::ERROR_INVAL;

      return -1;

    }

  if (m_shutdownSend)

    {

      return 0;

    }

  InetSocketAddress ad = InetSocketAddress::ConvertFrom (toAddress);

  Ptr<Ipv4> ipv4 = m_node->GetObject<Ipv4> ();

  Ipv4Address dst = ad.GetIpv4 ();

  Ipv4Address src = m_src;

  if (ipv4->GetRoutingProtocol ())

    {

      Ipv4Header header;

      if (!m_iphdrincl)

        {

          header.SetDestination (dst);

          header.SetProtocol (m_protocol);

        }

      else

        {

          p->RemoveHeader (header);

          dst = header.GetDestination ();

          src = header.GetSource ();

        }

      SocketErrno errno_ = ERROR_NOTERROR; //do not use errno as it is the standard C last error number

      Ptr<Ipv4Route> route;

      Ptr<NetDevice> oif = m_boundnetdevice; //specify non-zero if bound to a source address

      if (!oif && src != Ipv4Address::GetAny ())

        {

          int32_t index = ipv4->GetInterfaceForAddress (src);

          NS_ASSERT (index >= 0);

          oif = ipv4->GetNetDevice (index);

          NS_LOG_LOGIC ("Set index " << oif << "from source " << src);

        }

      // TBD-- we could cache the route and just check its validity

      route = ipv4->GetRoutingProtocol ()->RouteOutput (p, header, oif, errno_);

      if (route != 0)

        {

          NS_LOG_LOGIC ("Route exists");

          if (!m_iphdrincl)

            {

              ipv4->Send (p, route->GetSource (), dst, m_protocol, route);

            }

          else

            {

              ipv4->SendWithHeader (p, header, route);

            }

          NotifyDataSent (p->GetSize ());

          NotifySend (GetTxAvailable ());

          return p->GetSize ();

        }

      else

        {

          NS_LOG_DEBUG ("dropped because no outgoing route.");

          return -1;

        }

    }

  return 0;

}

uint32_t 

Ipv4RawSocketImpl::GetRxAvailable (void) const

{

  NS_LOG_FUNCTION (this);

  uint32_t rx = 0;

  for (std::list<Data>::const_iterator i = m_recv.begin (); i != m_recv.end (); ++i)

    {

      rx += (i->packet)->GetSize ();

    }

  return rx;

}

Ptr<Packet> 

Ipv4RawSocketImpl::Recv (uint32_t maxSize, uint32_t flags)

{

  NS_LOG_FUNCTION (this << maxSize << flags);

  Address tmp;

  return RecvFrom (maxSize, flags, tmp);

}

Ptr<Packet> 

Ipv4RawSocketImpl::RecvFrom (uint32_t maxSize, uint32_t flags,

                             Address &fromAddress)

{

  NS_LOG_FUNCTION (this << maxSize << flags << fromAddress);

  if (m_recv.empty ())

    {

      return 0;

    }

  struct Data data = m_recv.front ();

  m_recv.pop_front ();

  InetSocketAddress inet = InetSocketAddress (data.fromIp, data.fromProtocol);

  fromAddress = inet;

  if (data.packet->GetSize () > maxSize)

    {

      Ptr<Packet> first = data.packet->CreateFragment (0, maxSize);

      if (!(flags & MSG_PEEK))

        {

          data.packet->RemoveAtStart (maxSize);

        }

      m_recv.push_front (data);

      return first;

    }

  return data.packet;

}

void 

Ipv4RawSocketImpl::SetProtocol (uint16_t protocol)

{

  NS_LOG_FUNCTION (this << protocol);

  m_protocol = protocol;

}

bool 

Ipv4RawSocketImpl::ForwardUp (Ptr<const Packet> p, Ipv4Header ipHeader, Ptr<Ipv4Interface> incomingInterface)

{

  NS_LOG_FUNCTION (this << *p << ipHeader << incomingInterface);

  if (m_shutdownRecv)

    {

      return false;

    }

  Ptr<NetDevice> boundNetDevice = Socket::GetBoundNetDevice();

  if (boundNetDevice)

    {

      if (boundNetDevice != incomingInterface->GetDevice())

        {

          return false;

        }

    }

  NS_LOG_LOGIC ("src = " << m_src << " dst = " << m_dst);

  if ((m_src == Ipv4Address::GetAny () || ipHeader.GetDestination () == m_src) &&

      (m_dst == Ipv4Address::GetAny () || ipHeader.GetSource () == m_dst) &&

      ipHeader.GetProtocol () == m_protocol)

    {

      Ptr<Packet> copy = p->Copy ();

      // Should check via getsockopt ()..

      if (IsRecvPktInfo ())

        {

          Ipv4PacketInfoTag tag;

          copy->RemovePacketTag (tag);

          tag.SetRecvIf (incomingInterface->GetDevice ()->GetIfIndex ());

          copy->AddPacketTag (tag);

        }

      if (m_protocol == 1)

        {

          Icmpv4Header icmpHeader;

          copy->PeekHeader (icmpHeader);

          uint8_t type = icmpHeader.GetType ();

          if (type < 32 &&

              ((uint32_t(1) << type) & m_icmpFilter))

            {

              // filter out icmp packet.

              return false;

            }

        }

      copy->AddHeader (ipHeader);

      struct Data data;

      data.packet = copy;

      data.fromIp = ipHeader.GetSource ();

      data.fromProtocol = ipHeader.GetProtocol ();

      m_recv.push_back (data);

      NotifyDataRecv ();

      return true;

    }

  return false;

}

bool

Ipv4RawSocketImpl::SetAllowBroadcast (bool allowBroadcast)

{

  NS_LOG_FUNCTION (this << allowBroadcast);

  if (!allowBroadcast)

    {

      return false;

    }

  return true;

}

bool

Ipv4RawSocketImpl::GetAllowBroadcast () const

{

  NS_LOG_FUNCTION (this);

  return true;

}

} // namespace ns3