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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
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/* |
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* Copyright (c) 2007-2009 Strasbourg University |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation; |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* 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 |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* Author: Sebastien Vincent <vincent@clarinet.u-strasbg.fr> |
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* David Gross <gdavid.devel@gmail.com> |
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* Mehdi Benamor <benamor.mehdi@ensi.rnu.tn> |
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* Tommaso Pecorella <tommaso.pecorella@unifi.it> |
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*/ |
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|
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#include "ns3/log.h" |
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#include "ns3/ptr.h" |
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#include "ns3/assert.h" |
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#include "ns3/packet.h" |
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#include "ns3/node.h" |
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#include "ns3/boolean.h" |
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#include "ns3/ipv6-routing-protocol.h" |
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#include "ns3/ipv6-route.h" |
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#include "ns3/mac64-address.h" |
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#include "ns3/mac48-address.h" |
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#include "ns3/mac16-address.h" |
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#include "ns3/pointer.h" |
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#include "ns3/uinteger.h" |
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#include "ns3/string.h" |
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#include "ns3/sgi-hashmap.h" |
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#include "ns3/ipv6-l3-protocol.h" |
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#include "ns3/ipv6-interface.h" |
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|
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#include "sixlowpan-nd-protocol.h" |
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#include "sixlowpan-ndisc-cache.h" |
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#include "sixlowpan-ndisc-ra-options.h" |
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#include "sixlowpan-nd-header.h" |
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#include "sixlowpan-net-device.h" |
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#include "src/network/model/packet.h" |
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#include "src/core/model/integer.h" |
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#include "src/core/model/nstime.h" |
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|
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namespace ns3 { |
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|
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NS_LOG_COMPONENT_DEFINE ("SixLowPanNdProtocol"); |
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|
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NS_OBJECT_ENSURE_REGISTERED (SixLowPanNdProtocol); |
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|
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const uint16_t SixLowPanNdProtocol::MIN_CONTEXT_CHANGE_DELAY = 300; |
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|
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const uint8_t SixLowPanNdProtocol::MAX_RTR_ADVERTISEMENTS = 3; |
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const uint8_t SixLowPanNdProtocol::MIN_DELAY_BETWEEN_RAS = 10; |
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const uint8_t SixLowPanNdProtocol::MAX_RA_DELAY_TIME = 2; |
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const uint8_t SixLowPanNdProtocol::TENTATIVE_NCE_LIFETIME = 20; |
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|
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const uint8_t SixLowPanNdProtocol::MULTIHOP_HOPLIMIT = 64; |
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|
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const uint8_t SixLowPanNdProtocol::RTR_SOLICITATION_INTERVAL = 10; |
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const uint8_t SixLowPanNdProtocol::MAX_RTR_SOLICITATIONS = 3; |
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const uint8_t SixLowPanNdProtocol::MAX_RTR_SOLICITATION_INTERVAL = 60; |
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|
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SixLowPanNdProtocol::SixLowPanNdProtocol () |
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: m_rsRetransmit (0), |
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m_aroRetransmit (0) |
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{ |
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NS_LOG_FUNCTION (this); |
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} |
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|
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SixLowPanNdProtocol::~SixLowPanNdProtocol () |
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{ |
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NS_LOG_FUNCTION (this); |
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} |
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|
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TypeId SixLowPanNdProtocol::GetTypeId () |
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{ |
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static TypeId tid = TypeId ("ns3::SixLowPanNdProtocol") |
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.SetParent<Icmpv6L4Protocol> () |
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.SetGroupName ("Internet") |
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.AddConstructor<SixLowPanNdProtocol> () |
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.AddAttribute ("Border", "Is the node a 6LoWPAN Border Router.", |
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BooleanValue (false), |
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MakeBooleanAccessor (&SixLowPanNdProtocol::m_border), |
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MakeBooleanChecker ()) |
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.AddAttribute ("RegistrationLifeTime", "The amount of time (units of 60 seconds) that the router should retain the NCE for the node.", |
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UintegerValue (60), |
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MakeUintegerAccessor (&SixLowPanNdProtocol::m_regTime), |
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MakeUintegerChecker<uint16_t> ()) |
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.AddAttribute ("AdvanceTime", "The advance to perform maintaining of RA's information and registration.", |
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UintegerValue (5), |
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MakeUintegerAccessor (&SixLowPanNdProtocol::m_advance), |
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MakeUintegerChecker<uint16_t> ()) |
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; |
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return tid; |
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} |
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|
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Ptr<Packet> SixLowPanNdProtocol::ForgeNA (Ipv6Address src, Ipv6Address dst, Ipv6Address target, Address hardwareAddress, uint8_t flags) |
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{ |
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NS_LOG_FUNCTION (this << src << dst << hardwareAddress << (uint32_t)flags); |
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Ptr<Packet> p = Create<Packet> (); |
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Ipv6Header ipHeader; |
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Icmpv6NA na; |
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Icmpv6OptionLinkLayerAddress llOption (0, hardwareAddress); /* we give our mac address in response */ |
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|
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NS_LOG_LOGIC ("Send NA ( from " << src << " to " << dst << " target " << target << ")"); |
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|
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/* forge the entire NA packet from IPv6 header to ICMPv6 link-layer option, so that the packet does not pass by Icmpv6L4Protocol::Lookup again */ |
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|
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p->AddHeader (llOption); |
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na.SetIpv6Target (target); |
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|
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if ((flags & 1)) |
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{ |
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na.SetFlagO (true); |
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} |
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if ((flags & 2) && src != Ipv6Address::GetAny ()) |
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{ |
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na.SetFlagS (true); |
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} |
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if ((flags & 4)) |
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{ |
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na.SetFlagR (true); |
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} |
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|
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na.CalculatePseudoHeaderChecksum (src, dst, p->GetSize () + na.GetSerializedSize (), PROT_NUMBER); |
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p->AddHeader (na); |
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|
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ipHeader.SetSourceAddress (src); |
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ipHeader.SetDestinationAddress (dst); |
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ipHeader.SetNextHeader (PROT_NUMBER); |
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ipHeader.SetPayloadLength (p->GetSize ()); |
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ipHeader.SetHopLimit (255); |
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|
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p->AddHeader (ipHeader); |
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|
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return p; |
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} |
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|
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void SixLowPanNdProtocol::SendNS (Ipv6Address src, Ipv6Address dst, Ipv6Address target, |
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Address linkAddr) |
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{ |
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NS_LOG_FUNCTION (this << src << dst << target << linkAddr); |
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|
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Ptr<Ipv6L3Protocol> ipv6 = GetNode ()->GetObject<Ipv6L3Protocol> (); |
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uint32_t interfaceId = ipv6->GetInterfaceForAddress (src); |
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Ptr<Ipv6Interface> interface = ipv6->GetInterface (interfaceId); |
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Ptr<NdiscCache> cache = FindCache (interface->GetDevice ()); |
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|
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if (src != Ipv6Address::GetAny ()) |
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{ |
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NS_LOG_WARN ("An unspecified source address MUST NOT be used in NS messages."); |
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return; |
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} |
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|
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// only send NS if the target is a router. |
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NdiscCache::Entry *entry = cache->Lookup (dst); |
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if (entry) |
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{ |
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if (entry->IsRouter ()) |
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{ |
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Icmpv6L4Protocol::SendNS (interface->GetLinkLocalAddress ().GetAddress (), dst, |
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target, linkAddr); |
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} |
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} |
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} |
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|
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void SixLowPanNdProtocol::SendSixLowPanARO (Ipv6Address src, Ipv6Address dst, uint16_t time, |
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Mac64Address eui, Address linkAddr) |
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{ |
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NS_LOG_FUNCTION (this << src << dst << time << eui << linkAddr); |
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|
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/* an unspecified src MUST NOT be used in NS */ |
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|
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NS_ASSERT_MSG (src != Ipv6Address::GetAny (), "An unspecified source address MUST NOT be used in ARO messages."); |
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NS_ASSERT_MSG (!dst.IsMulticast (), "Destination address must not be a multicast address in ARO messages."); |
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|
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Ptr<Packet> p = Create<Packet> (); |
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Icmpv6NS ns (Ipv6Address::GetZero ()); |
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|
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/* ARO (request) + SLLAO */ |
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Icmpv6OptionAddressRegistration arOption (time, eui); |
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Icmpv6OptionLinkLayerAddress llOption (1, linkAddr); |
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|
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NS_LOG_LOGIC ("Send NS ( from " << src << " to " << dst << ")"); |
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|
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p->AddHeader (arOption); |
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p->AddHeader (llOption); |
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ns.CalculatePseudoHeaderChecksum (src, dst, p->GetSize () + ns.GetSerializedSize (), PROT_NUMBER); |
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p->AddHeader (ns); |
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|
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SendMessage (p, src, dst, 255); |
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} |
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|
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void SixLowPanNdProtocol::SendSixLowPanARO (Ipv6Address src, Ipv6Address dst, uint8_t status, |
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uint16_t time, Mac64Address eui) |
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{ |
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NS_LOG_FUNCTION (this << src << dst << static_cast<uint32_t> (status) << time << eui); |
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Ptr<Packet> p = Create<Packet> (); |
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Icmpv6NA na; |
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|
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/* ARO (response) */ |
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Icmpv6OptionAddressRegistration arOption (status, time, eui); |
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|
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NS_LOG_LOGIC ("Send NA ( from " << src << " to " << dst << ")"); |
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|
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na.SetIpv6Target (Ipv6Address::GetZero ()); |
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na.SetFlagO (false); |
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na.SetFlagS (true); |
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na.SetFlagR (true); |
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|
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p->AddHeader (arOption); |
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na.CalculatePseudoHeaderChecksum (src, dst, p->GetSize () + na.GetSerializedSize (), PROT_NUMBER); |
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p->AddHeader (na); |
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|
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SendMessage (p, src, dst, 255); |
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} |
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|
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void SixLowPanNdProtocol::SendSixLowPanRA (Ipv6Address src, Ipv6Address dst, Ptr<Ipv6Interface> interface) |
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{ |
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NS_LOG_FUNCTION (this << src << dst << interface); |
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|
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Ptr<SixLowPanNdiscCache> sixCache = FindSixLowPanCache (interface->GetDevice ()); |
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std::map<Ipv6Address, SixLowPanNdiscCache::SixLowPanRaEntry *> raCache = sixCache->GetRaCache (); |
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|
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for (std::map<Ipv6Address, SixLowPanNdiscCache::SixLowPanRaEntry *>::iterator it = raCache.begin (); |
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it != raCache.end (); it++) |
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{ |
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Icmpv6RA raHdr; |
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Ipv6Header ipHeader; |
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|
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Ptr<Packet> p = Create<Packet> (); |
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|
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/* set RA header information */ |
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raHdr.SetFlagM (it->second->IsManagedFlag ()); |
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raHdr.SetFlagO (it->second->IsOtherConfigFlag ()); |
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raHdr.SetFlagH (it->second->IsHomeAgentFlag ()); |
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raHdr.SetCurHopLimit (it->second->GetCurHopLimit ()); |
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raHdr.SetLifeTime (it->second->GetRouterLifeTime ()); |
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raHdr.SetReachableTime (it->second->GetReachableTime ()); |
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raHdr.SetRetransmissionTime (it->second->GetRetransTimer ()); |
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|
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/* Add ABRO */ |
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Icmpv6OptionAuthoritativeBorderRouter abroHdr; |
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abroHdr.SetVersion (it->second->GetVersion ()); |
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abroHdr.SetValidTime (it->second->GetValidTime ()); |
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abroHdr.SetRouterAddress (it->second->GetBorderAddress ()); |
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p->AddHeader (abroHdr); |
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|
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/* Add SLLAO */ |
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Address addr = interface->GetDevice ()->GetAddress (); |
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Icmpv6OptionLinkLayerAddress llaHdr (1, addr); |
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p->AddHeader (llaHdr); |
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|
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/* Add PIOs */ |
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std::map<Ipv6Address, Ptr<SixLowPanPrefix> > prefixes = it->second->GetPrefixes (); |
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for (std::map<Ipv6Address, Ptr<SixLowPanPrefix> >::iterator jt = prefixes.begin (); jt != prefixes.end (); jt++) |
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{ |
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Icmpv6OptionPrefixInformation prefixHdr; |
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prefixHdr.SetPrefixLength (jt->second->GetPrefixLength ()); |
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prefixHdr.SetFlags (jt->second->GetFlags ()); |
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prefixHdr.SetValidTime (jt->second->GetValidLifeTime ()); |
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prefixHdr.SetPreferredTime (jt->second->GetPreferredLifeTime ()); |
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prefixHdr.SetPrefix (jt->second->GetPrefix ()); |
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p->AddHeader (prefixHdr); |
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} |
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|
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/* Add 6COs */ |
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std::map<uint8_t, Ptr<SixLowPanContext> > contexts = it->second->GetContexts (); |
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for (std::map<uint8_t, Ptr<SixLowPanContext> >::iterator i = contexts.begin (); i != contexts.end (); i++) |
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{ |
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Icmpv6OptionSixLowPanContext sixHdr; |
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sixHdr.SetContextLen (i->second->GetContextLen ()); |
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sixHdr.SetFlagC (i->second->IsFlagC ()); |
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sixHdr.SetCid (i->second->GetCid ()); |
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sixHdr.SetValidTime (i->second->GetValidTime ()); |
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sixHdr.SetContextPrefix (i->second->GetContextPrefix ()); |
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p->AddHeader (sixHdr); |
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} |
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|
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raHdr.CalculatePseudoHeaderChecksum (src, dst, p->GetSize () + raHdr.GetSerializedSize (), PROT_NUMBER); |
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p->AddHeader (raHdr); |
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|
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ipHeader.SetSourceAddress (src); |
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ipHeader.SetDestinationAddress (dst); |
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ipHeader.SetNextHeader (PROT_NUMBER); |
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ipHeader.SetPayloadLength (p->GetSize ()); |
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ipHeader.SetHopLimit (255); |
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|
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/* send RA */ |
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NS_LOG_LOGIC ("Send RA to " << dst); |
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interface->Send (p, ipHeader, dst); |
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} |
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} |
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|
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void SixLowPanNdProtocol::SendSixLowPanDAR (Ipv6Address src, Ipv6Address dst, uint16_t time, Mac64Address eui, |
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Ipv6Address registered) |
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{ |
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NS_LOG_FUNCTION (this << src << dst << time << eui << registered); |
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Ptr<Packet> p = Create<Packet> (); |
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Icmpv6DuplicateAddress dar (time, eui, registered); |
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|
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NS_LOG_LOGIC ("Send DAR ( from " << src << " to " << dst << ")"); |
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|
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dar.CalculatePseudoHeaderChecksum (src, dst, p->GetSize () + dar.GetSerializedSize (), PROT_NUMBER); |
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p->AddHeader (dar); |
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|
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SendMessage (p, src, dst, MULTIHOP_HOPLIMIT); |
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} |
316 |
|
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enum IpL4Protocol::RxStatus SixLowPanNdProtocol::Receive (Ptr<Packet> packet, Ipv6Header const &header, |
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Ptr<Ipv6Interface> interface) |
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{ |
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NS_LOG_FUNCTION (this << packet << header.GetSourceAddress () << header.GetDestinationAddress () << |
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interface); |
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Ptr<Ipv6> ipv6 = GetNode ()->GetObject<Ipv6> (); |
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Ptr<SixLowPanNetDevice> sixDevice = DynamicCast<SixLowPanNetDevice> (interface->GetDevice()); |
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NS_ASSERT_MSG (sixDevice != NULL, "SixLowPanNdProtocol cannot be installed on device different from SixLowPanNetDevice"); |
325 |
|
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uint8_t type; |
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packet->CopyData (&type, sizeof(type)); |
328 |
|
329 |
switch (type) |
330 |
{ |
331 |
case Icmpv6Header::ICMPV6_ND_ROUTER_SOLICITATION: |
332 |
if (ipv6->IsForwarding (ipv6->GetInterfaceForDevice (sixDevice))) |
333 |
{ |
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HandleSixLowPanRS (packet, header.GetSourceAddress (), header.GetDestinationAddress (), interface); |
335 |
} |
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break; |
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case Icmpv6Header::ICMPV6_ND_ROUTER_ADVERTISEMENT: |
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HandleSixLowPanRA (packet, header.GetSourceAddress (), header.GetDestinationAddress (), interface); |
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break; |
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case Icmpv6Header::ICMPV6_ND_NEIGHBOR_SOLICITATION: |
341 |
if (ipv6->IsForwarding (ipv6->GetInterfaceForDevice (sixDevice))) |
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{ |
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HandleSixLowPanNS (packet, header.GetSourceAddress (), header.GetDestinationAddress (), interface); |
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} |
345 |
break; |
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case Icmpv6Header::ICMPV6_ND_NEIGHBOR_ADVERTISEMENT: |
347 |
HandleSixLowPanNA (packet, header.GetSourceAddress (), header.GetDestinationAddress (), interface); |
348 |
break; |
349 |
case Icmpv6Header::ICMPV6_ND_DUPLICATE_ADDRESS_CONFIRM: |
350 |
if (ipv6->IsForwarding (ipv6->GetInterfaceForDevice (sixDevice))) |
351 |
{ |
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HandleSixLowPanDAC (packet, header.GetSourceAddress (), header.GetDestinationAddress (), interface); |
353 |
} |
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break; |
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default: |
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return Icmpv6L4Protocol::Receive (packet, header, interface); |
357 |
break; |
358 |
} |
359 |
|
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return IpL4Protocol::RX_OK; |
361 |
} |
362 |
|
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void SixLowPanNdProtocol::DoDispose () |
364 |
{ |
365 |
NS_LOG_FUNCTION (this); |
366 |
|
367 |
for (SixLowPanCacheList::const_iterator it = m_sixlowCList.begin (); it != m_sixlowCList.end (); it++) |
368 |
{ |
369 |
Ptr<SixLowPanNdiscCache> cache = *it; |
370 |
cache->Dispose (); |
371 |
cache = 0; |
372 |
} |
373 |
m_sixlowCList.clear (); |
374 |
|
375 |
Icmpv6L4Protocol::DoDispose (); |
376 |
} |
377 |
|
378 |
void SixLowPanNdProtocol::HandleSixLowPanNS (Ptr<Packet> packet, Ipv6Address const &src, Ipv6Address const &dst, |
379 |
Ptr<Ipv6Interface> interface) |
380 |
{ |
381 |
NS_LOG_FUNCTION (this << packet << src << dst << interface); |
382 |
|
383 |
Icmpv6NS nsHdr; |
384 |
packet->RemoveHeader (nsHdr); |
385 |
Ipv6Address target = nsHdr.GetIpv6Target (); |
386 |
|
387 |
Ptr<SixLowPanNetDevice> sixDevice = DynamicCast<SixLowPanNetDevice> (interface->GetDevice()); |
388 |
NS_ASSERT_MSG (sixDevice != NULL, "SixLowPanNdProtocol cannot be installed on device different from SixLowPanNetDevice"); |
389 |
|
390 |
Icmpv6OptionLinkLayerAddress llaHdr (1); /* SLLAO */ |
391 |
Icmpv6OptionAddressRegistration aroHdr; |
392 |
|
393 |
bool next = true; |
394 |
bool hasLla = false; |
395 |
bool hasAro = false; |
396 |
|
397 |
if (src != Ipv6Address::GetAny ()) |
398 |
{ |
399 |
/* search all options following the NS header */ |
400 |
while (next == true) |
401 |
{ |
402 |
uint8_t type; |
403 |
packet->CopyData (&type, sizeof(type)); |
404 |
|
405 |
switch (type) |
406 |
{ |
407 |
case Icmpv6Header::ICMPV6_OPT_LINK_LAYER_SOURCE: |
408 |
if (!hasLla) |
409 |
{ |
410 |
packet->RemoveHeader (llaHdr); |
411 |
hasLla = true; |
412 |
} |
413 |
break; |
414 |
case Icmpv6Header::ICMPV6_OPT_ADDRESS_REGISTRATION: |
415 |
if (!hasAro) |
416 |
{ |
417 |
packet->RemoveHeader (aroHdr); |
418 |
hasAro = true; |
419 |
} |
420 |
break; |
421 |
default: |
422 |
/* unknow option, quit */ |
423 |
next = false; |
424 |
} |
425 |
} |
426 |
|
427 |
if (!hasLla) /* error! */ |
428 |
{ |
429 |
NS_LOG_ERROR ("NS message MUST have source link layer option."); |
430 |
return; |
431 |
} |
432 |
else /* NS + SLLAO */ |
433 |
{ |
434 |
/* Update "ARPv6" table with information of src */ |
435 |
Ptr<NdiscCache> cache = FindCache (sixDevice); |
436 |
|
437 |
NdiscCache::Entry* entry = 0; |
438 |
entry = cache->Lookup (src); |
439 |
|
440 |
if (!entry && src.IsLinkLocal()) |
441 |
{ |
442 |
entry = cache->Add (src); |
443 |
uint8_t buf[16]; |
444 |
src.GetBytes (buf); |
445 |
Mac16Address address; |
446 |
address.CopyFrom (buf+14); |
447 |
entry->SetRouter (false); |
448 |
entry->SetMacAddress (llaHdr.GetAddress ()); |
449 |
entry->MarkReachable (); |
450 |
} |
451 |
else if (!entry) |
452 |
{ |
453 |
entry = cache->Add (src); |
454 |
entry->SetRouter (false); |
455 |
entry->MarkStale (llaHdr.GetAddress ()); |
456 |
} |
457 |
else if (entry->GetMacAddress () != llaHdr.GetAddress ()) |
458 |
{ |
459 |
entry->MarkStale (llaHdr.GetAddress ()); |
460 |
} |
461 |
} |
462 |
|
463 |
if (!hasAro) /* NS + SLLAO */ |
464 |
{ |
465 |
/* Send NA to src with information requested about target (in "ARPv6" table) */ |
466 |
Ptr<NdiscCache> cache = FindCache (sixDevice); |
467 |
|
468 |
NdiscCache::Entry* entry = 0; |
469 |
entry = cache->Lookup (target); |
470 |
uint8_t flags; |
471 |
|
472 |
if (!entry) |
473 |
{ |
474 |
NS_LOG_LOGIC ("No entry with address " << target); |
475 |
return; |
476 |
} |
477 |
else |
478 |
{ |
479 |
if (entry->IsRouter ()) |
480 |
{ |
481 |
flags = 7; /* R + S + O flag */ |
482 |
} |
483 |
else |
484 |
{ |
485 |
flags = 3; /* S + O flags */ |
486 |
} |
487 |
|
488 |
/* NA + TLLAO */ |
489 |
Ptr<Packet> p = ForgeNA (interface->GetLinkLocalAddress ().GetAddress (), src, target, |
490 |
entry->GetMacAddress (), flags); |
491 |
Ipv6Header header; |
492 |
p->RemoveHeader (header); |
493 |
interface->Send (p, header, src); |
494 |
} |
495 |
} |
496 |
else /* NS + SLLAO + ARO */ |
497 |
{ |
498 |
/* Update NCE with information of src and ARO */ |
499 |
Ptr<SixLowPanNdiscCache> nCache = FindSixLowPanCache (sixDevice); |
500 |
|
501 |
SixLowPanNdiscCache::SixLowPanEntry* nEntry = 0; |
502 |
nEntry = nCache->SixLowPanLookup (src); |
503 |
|
504 |
std::map<Ipv6Address, SixLowPanNdiscCache::SixLowPanRaEntry *> raCache = nCache->GetRaCache (); |
505 |
|
506 |
if (!nEntry) /* no entry, creating */ |
507 |
{ |
508 |
if (aroHdr.GetRegTime () != 0) |
509 |
{ |
510 |
nEntry = nCache->SixLowPanAdd (src); |
511 |
nEntry->SetRouter (false); |
512 |
nEntry->SetMacAddress (llaHdr.GetAddress ()); |
513 |
nEntry->SetEui64 (aroHdr.GetEui64 ()); |
514 |
nEntry->MarkReachable (); |
515 |
|
516 |
if (m_multihopDad) /* multihop DAD used */ |
517 |
{ |
518 |
nEntry->MarkTentative (); |
519 |
for (std::map<Ipv6Address, SixLowPanNdiscCache::SixLowPanRaEntry *>::iterator it = raCache.begin (); |
520 |
it != raCache.end (); it++) |
521 |
{ |
522 |
Ipv6Address destination = it->second->GetBorderAddress (); |
523 |
SendSixLowPanDAR (interface->GetAddressMatchingDestination (destination).GetAddress (), destination, |
524 |
aroHdr.GetRegTime (), aroHdr.GetEui64 (), src); |
525 |
} |
526 |
return; |
527 |
} |
528 |
else /* multihop DAD NOT used */ |
529 |
{ |
530 |
nEntry->MarkRegistered (aroHdr.GetRegTime ()); |
531 |
SendSixLowPanARO (interface->GetLinkLocalAddress ().GetAddress (), src, 0, aroHdr.GetRegTime (), |
532 |
aroHdr.GetEui64 ()); |
533 |
return; |
534 |
} |
535 |
} |
536 |
} |
537 |
else if (nEntry->GetEui64 () == aroHdr.GetEui64 ()) /* entry found, same EUI-64, updating */ |
538 |
{ |
539 |
if (aroHdr.GetRegTime () != 0) |
540 |
{ |
541 |
nEntry->SetRouter (false); |
542 |
nEntry->SetMacAddress (llaHdr.GetAddress ()); |
543 |
nEntry->MarkReachable (); |
544 |
nEntry->MarkRegistered (aroHdr.GetRegTime ()); |
545 |
SendSixLowPanARO (interface->GetLinkLocalAddress ().GetAddress (), src, 0, aroHdr.GetRegTime (), |
546 |
aroHdr.GetEui64 ()); |
547 |
|
548 |
if (m_multihopDad) |
549 |
{ |
550 |
for (std::map<Ipv6Address, SixLowPanNdiscCache::SixLowPanRaEntry *>::iterator it = raCache.begin (); |
551 |
it != raCache.end (); it++) |
552 |
{ |
553 |
Ipv6Address destination = it->second->GetBorderAddress (); |
554 |
|
555 |
/* Send request to update entry from DAD table */ |
556 |
SendSixLowPanDAR (interface->GetAddressMatchingDestination (destination).GetAddress (), destination, |
557 |
aroHdr.GetRegTime (), aroHdr.GetEui64 (), src); |
558 |
} |
559 |
} |
560 |
|
561 |
return; |
562 |
} |
563 |
else /* ARO's Registration Lifetime = 0 */ |
564 |
{ |
565 |
if (m_multihopDad) |
566 |
{ |
567 |
for (std::map<Ipv6Address, SixLowPanNdiscCache::SixLowPanRaEntry *>::iterator it = raCache.begin (); |
568 |
it != raCache.end (); it++) |
569 |
{ |
570 |
Ipv6Address destination = it->second->GetBorderAddress (); |
571 |
|
572 |
/* Send request to remove entry from DAD table */ |
573 |
SendSixLowPanDAR (interface->GetAddressMatchingDestination (destination).GetAddress (), destination, |
574 |
aroHdr.GetRegTime (), aroHdr.GetEui64 (), src); |
575 |
} |
576 |
} |
577 |
/* Remove the entry from Neighbor Cache */ |
578 |
nCache->SixLowPanRemove (nEntry); |
579 |
|
580 |
/* Remove the entry from "ARPv6" table */ |
581 |
Ptr<NdiscCache> cache = FindCache (sixDevice); |
582 |
|
583 |
NdiscCache::Entry* entry = 0; |
584 |
entry = cache->Lookup (src); |
585 |
cache->Remove (entry); |
586 |
return; |
587 |
} |
588 |
} |
589 |
else /* entry found, different EUI-64 */ |
590 |
{ |
591 |
if (m_multihopDad && nEntry->IsRegistered ()) |
592 |
{ |
593 |
SendSixLowPanARO (interface->GetLinkLocalAddress ().GetAddress (), |
594 |
sixDevice->MakeLinkLocalAddressFromMac (aroHdr.GetEui64 ()), 1, |
595 |
aroHdr.GetRegTime (), aroHdr.GetEui64 ()); |
596 |
} |
597 |
else if (!m_multihopDad) |
598 |
{ |
599 |
SendSixLowPanARO (interface->GetLinkLocalAddress ().GetAddress (), |
600 |
sixDevice->MakeLinkLocalAddressFromMac (aroHdr.GetEui64 ()), 1, |
601 |
aroHdr.GetRegTime (), aroHdr.GetEui64 ()); |
602 |
} |
603 |
return; |
604 |
} |
605 |
} |
606 |
} |
607 |
else |
608 |
{ |
609 |
NS_LOG_ERROR ("An unspecified source address MUST NOT be used in NS messages."); |
610 |
return; |
611 |
} |
612 |
} |
613 |
|
614 |
void SixLowPanNdProtocol::HandleSixLowPanNA (Ptr<Packet> packet, Ipv6Address const &src, Ipv6Address const &dst, |
615 |
Ptr<Ipv6Interface> interface) |
616 |
{ |
617 |
NS_LOG_FUNCTION (this << packet << src << dst << interface); |
618 |
|
619 |
Ptr<Packet> p = packet->Copy (); |
620 |
Icmpv6NS naHdr; |
621 |
packet->RemoveHeader (naHdr); |
622 |
Ipv6Address target = naHdr.GetIpv6Target (); |
623 |
|
624 |
Icmpv6OptionLinkLayerAddress llaHdr (0); /* TLLAO */ |
625 |
Icmpv6OptionAddressRegistration aroHdr; |
626 |
|
627 |
uint8_t type; |
628 |
packet->CopyData (&type, sizeof(type)); |
629 |
|
630 |
switch (type) |
631 |
{ |
632 |
case Icmpv6Header::ICMPV6_OPT_LINK_LAYER_TARGET: /* NA + TLLAO */ |
633 |
|
634 |
HandleNA (p, target, dst, interface); /* Handle response of Address Resolution */ |
635 |
|
636 |
break; |
637 |
case Icmpv6Header::ICMPV6_OPT_ADDRESS_REGISTRATION: /* NA + ARO */ |
638 |
|
639 |
packet->RemoveHeader (aroHdr); |
640 |
|
641 |
m_aroRetransmit = 0; |
642 |
|
643 |
if (aroHdr.GetStatus () == 0) /* status=0, success! */ |
644 |
{ |
645 |
/* schedule a new ARO to maintain NCE in routers */ |
646 |
|
647 |
Simulator::Schedule (Time (Minutes (aroHdr.GetRegTime () - m_advance)), &SixLowPanNdProtocol::RetransmitARO, this, |
648 |
dst, src, aroHdr.GetRegTime (), aroHdr.GetEui64 (), interface->GetDevice ()->GetAddress ()); |
649 |
} |
650 |
else /* status NOT 0, fail! */ |
651 |
{ |
652 |
NS_LOG_LOGIC ("ARO status is NOT 0, registration failed!"); |
653 |
/// \todo implement method to remove address that generated error. |
654 |
return; |
655 |
} |
656 |
break; |
657 |
default: |
658 |
NS_LOG_ERROR ("NA message MUST have option."); |
659 |
return; |
660 |
} |
661 |
} |
662 |
|
663 |
void SixLowPanNdProtocol::HandleSixLowPanRS (Ptr<Packet> packet, Ipv6Address const &src, Ipv6Address const &dst, |
664 |
Ptr<Ipv6Interface> interface) |
665 |
{ |
666 |
NS_LOG_FUNCTION (this << packet << src << dst << interface); |
667 |
|
668 |
Ptr<SixLowPanNetDevice> sixDevice = DynamicCast<SixLowPanNetDevice> (interface->GetDevice()); |
669 |
NS_ASSERT_MSG (sixDevice != NULL, "SixLowPanNdProtocol cannot be installed on device different from SixLowPanNetDevice"); |
670 |
|
671 |
Icmpv6RS rsHeader; |
672 |
Icmpv6OptionLinkLayerAddress lla (1); |
673 |
|
674 |
packet->RemoveHeader (rsHeader); |
675 |
|
676 |
if (src != Ipv6Address::GetAny ()) |
677 |
{ |
678 |
uint8_t type; |
679 |
packet->CopyData (&type, sizeof(type)); |
680 |
|
681 |
if (type != Icmpv6Header::ICMPV6_OPT_LINK_LAYER_SOURCE) |
682 |
{ |
683 |
NS_LOG_ERROR ("RS message MUST have source link layer option."); |
684 |
return; |
685 |
} |
686 |
|
687 |
packet->RemoveHeader (lla); |
688 |
|
689 |
/* Update Neighbor Cache */ |
690 |
Ptr<SixLowPanNdiscCache> sixCache = FindSixLowPanCache (sixDevice); |
691 |
SixLowPanNdiscCache::SixLowPanEntry* sixEntry = 0; |
692 |
sixEntry = sixCache->SixLowPanLookup (src); |
693 |
if (!sixEntry) |
694 |
{ |
695 |
sixEntry = sixCache->SixLowPanAdd (src); |
696 |
sixEntry->SetRouter (false); |
697 |
sixEntry->MarkStale (lla.GetAddress ()); |
698 |
sixEntry->MarkTentative (); |
699 |
NS_LOG_LOGIC ("Tentative entry created from RS"); |
700 |
} |
701 |
else if (sixEntry->GetMacAddress () != lla.GetAddress ()) |
702 |
{ |
703 |
sixEntry->MarkStale (lla.GetAddress ()); |
704 |
} |
705 |
|
706 |
/* Update "ARPv6" table */ |
707 |
Ptr<NdiscCache> cache = FindCache (sixDevice); |
708 |
NdiscCache::Entry* entry = 0; |
709 |
entry = cache->Lookup (src); |
710 |
if (!entry) |
711 |
{ |
712 |
entry = cache->Add (src); |
713 |
entry->SetRouter (false); |
714 |
entry->MarkStale (lla.GetAddress ()); |
715 |
} |
716 |
else if (entry->GetMacAddress () != lla.GetAddress ()) |
717 |
{ |
718 |
entry->MarkStale (lla.GetAddress ()); |
719 |
} |
720 |
} |
721 |
|
722 |
if (!m_border) |
723 |
{ |
724 |
Address addr = lla.GetAddress (); |
725 |
Ipv6Address destination = sixDevice->MakeLinkLocalAddressFromMac(addr); |
726 |
|
727 |
SendSixLowPanRA (interface->GetLinkLocalAddress ().GetAddress (), destination, interface); |
728 |
} |
729 |
} |
730 |
|
731 |
void SixLowPanNdProtocol::HandleSixLowPanRA (Ptr<Packet> packet, Ipv6Address const &src, Ipv6Address const &dst, |
732 |
Ptr<Ipv6Interface> interface) |
733 |
{ |
734 |
NS_LOG_FUNCTION (this << packet << src << dst << interface); |
735 |
|
736 |
m_rsRetransmit = 0; |
737 |
m_receivedRA = true; |
738 |
|
739 |
Ptr<SixLowPanNetDevice> sixDevice = DynamicCast<SixLowPanNetDevice> (interface->GetDevice()); |
740 |
NS_ASSERT_MSG (sixDevice != NULL, "SixLowPanNdProtocol cannot be installed on device different from SixLowPanNetDevice"); |
741 |
|
742 |
Address addr = sixDevice->GetAddress (); |
743 |
|
744 |
Icmpv6RA raHeader; |
745 |
Ptr<Ipv6L3Protocol> ipv6 = GetNode ()->GetObject<Ipv6L3Protocol> (); |
746 |
|
747 |
Icmpv6OptionAuthoritativeBorderRouter abrHdr; /* ABRO */ |
748 |
Icmpv6OptionLinkLayerAddress llaHdr (1); /* SLLAO */ |
749 |
|
750 |
bool next = true; |
751 |
Ptr<SixLowPanNdiscCache> sixCache = FindSixLowPanCache (sixDevice); |
752 |
SixLowPanNdiscCache::SixLowPanRaEntry* ra = 0; |
753 |
|
754 |
Ptr<NdiscCache> cache = FindCache (sixDevice); |
755 |
// sgi::hash_map<Ipv6Address, NdiscCache::Entry *, Ipv6AddressHash> ndiscCache = cache->GetNdiscCache (); |
756 |
|
757 |
uint32_t version; |
758 |
Ipv6Address border; |
759 |
|
760 |
packet->RemoveHeader (raHeader); |
761 |
|
762 |
Ipv6Address defaultRouter = Ipv6Address::GetZero (); |
763 |
|
764 |
if (raHeader.GetLifeTime()) |
765 |
{ |
766 |
defaultRouter = src; |
767 |
} |
768 |
|
769 |
std::list<Icmpv6OptionPrefixInformation> prefixList; |
770 |
std::list<Icmpv6OptionSixLowPanContext> contextList; |
771 |
Icmpv6OptionPrefixInformation prefixHdr; |
772 |
Icmpv6OptionSixLowPanContext contextHdr; |
773 |
|
774 |
// \todo check the stop condiiton |
775 |
while (next == true) |
776 |
{ |
777 |
uint8_t type = 0; |
778 |
packet->CopyData (&type, sizeof(type)); |
779 |
|
780 |
switch (type) |
781 |
{ |
782 |
case Icmpv6Header::ICMPV6_OPT_PREFIX: |
783 |
packet->RemoveHeader (prefixHdr); |
784 |
prefixList.push_back (prefixHdr); |
785 |
break; |
786 |
case Icmpv6Header::ICMPV6_OPT_SIXLOWPAN_CONTEXT: |
787 |
packet->RemoveHeader (contextHdr); |
788 |
contextList.push_back (contextHdr); |
789 |
break; |
790 |
case Icmpv6Header::ICMPV6_OPT_AUTHORITATIVE_BORDER_ROUTER: |
791 |
packet->RemoveHeader (abrHdr); |
792 |
version = abrHdr.GetVersion (); |
793 |
border = abrHdr.GetRouterAddress (); |
794 |
break; |
795 |
case Icmpv6Header::ICMPV6_OPT_LINK_LAYER_SOURCE: |
796 |
packet->RemoveHeader (llaHdr); |
797 |
ReceiveLLA (llaHdr, src, dst, interface); // generates an entry in NDISC table with m_router = true |
798 |
break; |
799 |
default: |
800 |
/* Unknown option, quit */ |
801 |
next = false; |
802 |
break; |
803 |
} |
804 |
} |
805 |
|
806 |
ra = sixCache->RaEntryLookup (border); |
807 |
if (!ra) // Create a new entry |
808 |
{ |
809 |
ra = sixCache->AddRaEntry (border); |
810 |
ra->SetManagedFlag (raHeader.GetFlagM ()); |
811 |
ra->SetOtherConfigFlag (raHeader.GetFlagO ()); |
812 |
ra->SetHomeAgentFlag (raHeader.GetFlagH ()); |
813 |
ra->SetReachableTime (raHeader.GetReachableTime ()); |
814 |
ra->SetRouterLifeTime (raHeader.GetLifeTime ()); |
815 |
ra->SetRetransTimer (raHeader.GetRetransmissionTime ()); |
816 |
ra->SetCurHopLimit (raHeader.GetCurHopLimit ()); |
817 |
ra->SetVersion (version); |
818 |
ra->SetValidTime (abrHdr.GetValidTime ()); |
819 |
|
820 |
// for (std::list<Icmpv6OptionPrefixInformation>::iterator it = prefixList.begin (); it != prefixList.end (); it++) |
821 |
// { |
822 |
// Ptr<SixLowPanPrefix> prefix = new SixLowPanPrefix; |
823 |
// prefix->SetPrefixLength ((*it).GetPrefixLength ()); |
824 |
// prefix->SetFlags ((*it).GetFlags ()); |
825 |
// prefix->SetValidLifeTime ((*it).GetValidTime ()); |
826 |
// prefix->SetPreferredLifeTime ((*it).GetPreferredTime ()); |
827 |
// prefix->SetPrefix ((*it).GetPrefix ()); |
828 |
// |
829 |
// ra->AddPrefix (prefix); |
830 |
// |
831 |
// ipv6->AddAutoconfiguredAddress (ipv6->GetInterfaceForDevice (sixDevice), |
832 |
// (*it).GetPrefix (),(*it).GetPrefixLength (), |
833 |
// (*it).GetFlags (), (*it).GetValidTime (), |
834 |
// (*it).GetPreferredTime (), defaultRouter); |
835 |
// |
836 |
// for (sgi::hash_map<Ipv6Address, NdiscCache::Entry *, Ipv6AddressHash>::iterator k = ndiscCache.begin (); |
837 |
// k != ndiscCache.end (); k++) |
838 |
// { |
839 |
// if (k->second->IsRouter ()) |
840 |
// { |
841 |
// SendSixLowPanARO (sixDevice->MakeGlobalAddressFromMac(addr, (*it).GetPrefix ()), |
842 |
// k->second->GetIpv6Address (), m_regTime, Mac64Address::ConvertFrom (addr), |
843 |
// addr); |
844 |
// |
845 |
// Simulator::Schedule (Time (Minutes (m_regTime - m_advance)), &SixLowPanNdProtocol::RetransmitARO, this, |
846 |
// sixDevice->MakeGlobalAddressFromMac(addr, (*it).GetPrefix ()), |
847 |
// k->second->GetIpv6Address (), m_regTime, Mac64Address::ConvertFrom (addr), |
848 |
// addr); |
849 |
// } |
850 |
// } |
851 |
// } |
852 |
// \todo quiet compiler |
853 |
NS_ASSERT (m_regTime); |
854 |
|
855 |
for (std::list<Icmpv6OptionSixLowPanContext>::iterator jt = contextList.begin (); jt != contextList.end (); jt++) |
856 |
{ |
857 |
Ptr<SixLowPanContext> context = new SixLowPanContext; |
858 |
context->SetCid ((*jt).GetCid ()); |
859 |
context->SetFlagC ((*jt).IsFlagC ()); |
860 |
context->SetValidTime ((*jt).GetValidTime ()); |
861 |
context->SetContextPrefix ((*jt).GetContextPrefix ()); |
862 |
|
863 |
ra->AddContext (context); |
864 |
} |
865 |
} |
866 |
else if (ra && version > (ra->GetVersion ())) // Update existing entry from 6LBR with new information |
867 |
{ |
868 |
ra->SetManagedFlag (raHeader.GetFlagM ()); |
869 |
ra->SetOtherConfigFlag (raHeader.GetFlagO ()); |
870 |
ra->SetHomeAgentFlag (raHeader.GetFlagH ()); |
871 |
ra->SetReachableTime (raHeader.GetReachableTime ()); |
872 |
ra->SetRouterLifeTime (raHeader.GetLifeTime ()); |
873 |
ra->SetRetransTimer (raHeader.GetRetransmissionTime ()); |
874 |
ra->SetCurHopLimit (raHeader.GetCurHopLimit ()); |
875 |
ra->SetVersion (version); |
876 |
ra->SetValidTime (abrHdr.GetValidTime ()); |
877 |
|
878 |
for (std::list<Icmpv6OptionPrefixInformation>::iterator it = prefixList.begin (); it != prefixList.end (); it++) |
879 |
{ |
880 |
if (ra->GetPrefixes ().find ((*it).GetPrefix ()) == ra->GetPrefixes ().end ()) /* prefix NOT found */ |
881 |
{ |
882 |
Ptr<SixLowPanPrefix> prefix = new SixLowPanPrefix; |
883 |
prefix->SetPrefixLength ((*it).GetPrefixLength ()); |
884 |
prefix->SetFlags ((*it).GetFlags ()); |
885 |
prefix->SetValidLifeTime ((*it).GetValidTime ()); |
886 |
prefix->SetPreferredLifeTime ((*it).GetPreferredTime ()); |
887 |
prefix->SetPrefix ((*it).GetPrefix ()); |
888 |
|
889 |
ra->AddPrefix (prefix); |
890 |
|
891 |
ipv6->AddAutoconfiguredAddress (ipv6->GetInterfaceForDevice (sixDevice), |
892 |
(*it).GetPrefix (), (*it).GetPrefixLength (), |
893 |
(*it).GetFlags (), (*it).GetValidTime (), |
894 |
(*it).GetPreferredTime (), defaultRouter); |
895 |
// for (sgi::hash_map<Ipv6Address, NdiscCache::Entry *, Ipv6AddressHash>::iterator kt = ndiscCache.begin (); |
896 |
// kt != ndiscCache.end (); kt++) |
897 |
// { |
898 |
// if (kt->second->IsRouter ()) |
899 |
// { |
900 |
// SendSixLowPanARO (sixDevice->MakeGlobalAddressFromMac(addr, (*it).GetPrefix ()), |
901 |
// kt->second->GetIpv6Address (), m_regTime, |
902 |
// Mac64Address::ConvertFrom (addr), addr); |
903 |
// |
904 |
// Simulator::Schedule (Time (Minutes (m_regTime - m_advance)), &SixLowPanNdProtocol::RetransmitARO, this, |
905 |
// sixDevice->MakeGlobalAddressFromMac(addr, (*it).GetPrefix ()), |
906 |
// kt->second->GetIpv6Address (), m_regTime, Mac64Address::ConvertFrom (addr), |
907 |
// addr); |
908 |
// } |
909 |
// } |
910 |
} |
911 |
else /* prefix found, updating! */ |
912 |
{ |
913 |
Ptr<SixLowPanPrefix> prefix = (ra->GetPrefixes().find((*it).GetPrefix ()))->second; |
914 |
|
915 |
prefix->SetPrefixLength ((*it).GetPrefixLength ()); |
916 |
prefix->SetFlags ((*it).GetFlags ()); |
917 |
prefix->SetValidLifeTime ((*it).GetValidTime ()); |
918 |
prefix->SetPreferredLifeTime ((*it).GetPreferredTime ()); |
919 |
|
920 |
ipv6->AddAutoconfiguredAddress (ipv6->GetInterfaceForDevice (sixDevice), |
921 |
(*it).GetPrefix (), (*it).GetPrefixLength (), |
922 |
(*it).GetFlags (), (*it).GetValidTime (), |
923 |
(*it).GetPreferredTime (), defaultRouter); |
924 |
// for (sgi::hash_map<Ipv6Address, NdiscCache::Entry *, Ipv6AddressHash>::iterator lt = ndiscCache.begin (); |
925 |
// lt != ndiscCache.end (); lt++) |
926 |
// { |
927 |
// if (lt->second->IsRouter ()) |
928 |
// { |
929 |
// SendSixLowPanARO (sixDevice->MakeGlobalAddressFromMac(addr, (*it).GetPrefix ()), |
930 |
// lt->second->GetIpv6Address (), m_regTime, Mac64Address::ConvertFrom (addr), |
931 |
// addr); |
932 |
// |
933 |
// Simulator::Schedule (Time (Minutes (m_regTime - m_advance)), &SixLowPanNdProtocol::RetransmitARO, this, |
934 |
// sixDevice->MakeGlobalAddressFromMac(addr, (*it).GetPrefix ()), |
935 |
// lt->second->GetIpv6Address (), m_regTime, Mac64Address::ConvertFrom (addr), |
936 |
// addr); |
937 |
// } |
938 |
// } |
939 |
} |
940 |
} |
941 |
|
942 |
for (std::list<Icmpv6OptionSixLowPanContext>::iterator jt = contextList.begin (); jt != contextList.end (); jt++) |
943 |
{ |
944 |
if (ra->GetContexts ().find ((*jt).GetCid ()) == ra->GetContexts ().end ()) /* context NOT found */ |
945 |
{ |
946 |
Ptr<SixLowPanContext> context = new SixLowPanContext; |
947 |
context->SetCid ((*jt).GetCid ()); |
948 |
context->SetFlagC ((*jt).IsFlagC ()); |
949 |
context->SetValidTime ((*jt).GetValidTime ()); |
950 |
context->SetContextPrefix ((*jt).GetContextPrefix ()); |
951 |
|
952 |
ra->AddContext (context); |
953 |
} |
954 |
else |
955 |
{ |
956 |
Ptr<SixLowPanContext> context = (ra->GetContexts ().find ((*jt).GetCid ()))->second; |
957 |
|
958 |
context->SetFlagC ((*jt).IsFlagC ()); |
959 |
context->SetValidTime ((*jt).GetValidTime ()); |
960 |
context->SetContextPrefix ((*jt).GetContextPrefix ()); |
961 |
} |
962 |
} |
963 |
} |
964 |
else // Old information, not updating |
965 |
{ |
966 |
return; |
967 |
} |
968 |
|
969 |
uint32_t t = raHeader.GetLifeTime (); |
970 |
|
971 |
for (std::list<Icmpv6OptionPrefixInformation>::iterator it = prefixList.begin (); it != prefixList.end (); it++) |
972 |
{ |
973 |
t = t < ((*it).GetValidTime ()) ? t : ((*it).GetValidTime ()); |
974 |
} |
975 |
for (std::list<Icmpv6OptionSixLowPanContext>::iterator jt = contextList.begin (); jt != contextList.end (); jt++) |
976 |
{ |
977 |
t = (60 * ((*jt).GetValidTime ())) < t ? (60 * ((*jt).GetValidTime ())) : t; |
978 |
} |
979 |
|
980 |
t -= (60 * m_advance); |
981 |
|
982 |
Simulator::Schedule (Time (Seconds (t - 1)), &SixLowPanNdProtocol::SetReceivedRA, this, false); |
983 |
Simulator::Schedule (Time (Seconds (t)), &SixLowPanNdProtocol::RetransmitRS, this, |
984 |
interface->GetLinkLocalAddress ().GetAddress (), src, addr); |
985 |
} |
986 |
/// \todo da finire!! (controlla codice, controlla regTime) |
987 |
|
988 |
void SixLowPanNdProtocol::HandleSixLowPanDAC (Ptr<Packet> packet, Ipv6Address const &src, Ipv6Address const &dst, |
989 |
Ptr<Ipv6Interface> interface) |
990 |
{ |
991 |
NS_LOG_FUNCTION (this << packet << src << dst << interface); |
992 |
|
993 |
Ptr<SixLowPanNetDevice> sixDevice = DynamicCast<SixLowPanNetDevice> (interface->GetDevice()); |
994 |
NS_ASSERT_MSG (sixDevice != NULL, "SixLowPanNdProtocol cannot be installed on device different from SixLowPanNetDevice"); |
995 |
|
996 |
Icmpv6DuplicateAddress dacHdr (0); |
997 |
packet->RemoveHeader (dacHdr); |
998 |
|
999 |
if (m_multihopDad) |
1000 |
{ |
1001 |
Ipv6Address reg = dacHdr.GetRegAddress (); |
1002 |
|
1003 |
if (!reg.IsMulticast () && src != Ipv6Address::GetAny () && !src.IsMulticast ()) |
1004 |
{ |
1005 |
Ptr<SixLowPanNdiscCache> cache = FindSixLowPanCache (sixDevice); |
1006 |
SixLowPanNdiscCache::SixLowPanEntry* entry = 0; |
1007 |
entry = cache->SixLowPanLookup (reg); |
1008 |
|
1009 |
if (dacHdr.GetStatus () == 0) /* mark the entry as registered, send ARO with status=0 */ |
1010 |
{ |
1011 |
entry->MarkRegistered (dacHdr.GetRegTime ()); |
1012 |
|
1013 |
SendSixLowPanARO (dst, dacHdr.GetRegAddress (), dacHdr.GetStatus (), dacHdr.GetRegTime (), |
1014 |
dacHdr.GetEui64 ()); |
1015 |
} |
1016 |
else /* remove the tentative entry, send ARO with error code */ |
1017 |
{ |
1018 |
cache->SixLowPanRemove (entry); |
1019 |
|
1020 |
Ipv6Address address = sixDevice->MakeLinkLocalAddressFromMac (dacHdr.GetEui64 ()); |
1021 |
|
1022 |
SendSixLowPanARO (dst, address, dacHdr.GetStatus (), dacHdr.GetRegTime (), dacHdr.GetEui64 ()); |
1023 |
} |
1024 |
} |
1025 |
else |
1026 |
{ |
1027 |
NS_LOG_ERROR ("Validity checks for DAR not satisfied."); |
1028 |
return; |
1029 |
} |
1030 |
} |
1031 |
} |
1032 |
|
1033 |
Ptr<SixLowPanNdiscCache> SixLowPanNdProtocol::FindSixLowPanCache (Ptr<NetDevice> device) |
1034 |
{ |
1035 |
NS_LOG_FUNCTION (this << device); |
1036 |
|
1037 |
for (SixLowPanCacheList::const_iterator it = m_sixlowCList.begin (); it != m_sixlowCList.end (); it++) |
1038 |
{ |
1039 |
if ((*it)->GetDevice () == device) |
1040 |
{ |
1041 |
return *it; |
1042 |
} |
1043 |
} |
1044 |
|
1045 |
/* quiet compiler */ |
1046 |
return 0; |
1047 |
} |
1048 |
|
1049 |
void SixLowPanNdProtocol::RetransmitARO (Ipv6Address src, Ipv6Address dst, uint16_t time, |
1050 |
Mac64Address eui, Address linkAddr) |
1051 |
{ |
1052 |
NS_LOG_FUNCTION (this << src << dst << time << eui << linkAddr); |
1053 |
|
1054 |
IntegerValue maxUnicastSolicit; |
1055 |
GetAttribute ("MaxUnicastSolicit", maxUnicastSolicit); |
1056 |
if (m_aroRetransmit < maxUnicastSolicit.Get ()) |
1057 |
{ |
1058 |
m_aroRetransmit++; |
1059 |
|
1060 |
SendSixLowPanARO (src, dst, time, eui, linkAddr); |
1061 |
|
1062 |
TimeValue retransmissionTime; |
1063 |
GetAttribute ("RetransmissionTime", retransmissionTime); |
1064 |
|
1065 |
Simulator::Schedule (retransmissionTime.Get (), &SixLowPanNdProtocol::RetransmitARO, this, |
1066 |
src, dst, time, eui, linkAddr); |
1067 |
return; |
1068 |
} |
1069 |
else |
1070 |
{ |
1071 |
return; |
1072 |
} |
1073 |
} |
1074 |
|
1075 |
void SixLowPanNdProtocol::RetransmitRS (Ipv6Address src, Ipv6Address dst, Address linkAddr) |
1076 |
{ |
1077 |
NS_LOG_FUNCTION (this << src << dst << linkAddr); |
1078 |
|
1079 |
/* if the source is NOT unspec, send a RS message + SLLA option */ |
1080 |
if (src != Ipv6Address::GetAny ()) |
1081 |
{ |
1082 |
if (!m_receivedRA && m_rsRetransmit < MAX_RTR_SOLICITATIONS) |
1083 |
{ |
1084 |
m_rsRetransmit++; |
1085 |
|
1086 |
SendRS (src, dst, linkAddr); |
1087 |
|
1088 |
Simulator::Schedule (Time (Seconds (RTR_SOLICITATION_INTERVAL)), &SixLowPanNdProtocol::RetransmitRS, this, |
1089 |
src, dst, linkAddr); |
1090 |
return; |
1091 |
} |
1092 |
else if (!m_receivedRA) |
1093 |
{ |
1094 |
m_rsRetransmit++; |
1095 |
|
1096 |
Ipv6Address destination = Ipv6Address::GetAllRoutersMulticast (); |
1097 |
|
1098 |
SendRS (src, destination, linkAddr); |
1099 |
|
1100 |
Simulator::Schedule (Time (Seconds (MAX_RTR_SOLICITATION_INTERVAL)), &SixLowPanNdProtocol::RetransmitRS, this, |
1101 |
src, destination, linkAddr); |
1102 |
/* inserire truncated binary exponential backoff */ |
1103 |
return; |
1104 |
} |
1105 |
else |
1106 |
{ |
1107 |
return; |
1108 |
} |
1109 |
} |
1110 |
else |
1111 |
{ |
1112 |
NS_LOG_ERROR ("An unspecified source address MUST NOT be used in RS messages."); |
1113 |
return; |
1114 |
} |
1115 |
} |
1116 |
/// \todo da finire!! (truncated binary exponential backoff) |
1117 |
|
1118 |
void SixLowPanNdProtocol::SetReceivedRA (bool received) |
1119 |
{ |
1120 |
NS_LOG_FUNCTION (this << received); |
1121 |
m_receivedRA = received; |
1122 |
} |
1123 |
|
1124 |
} /* namespace ns3 */ |