| // -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- |
| // |
| // Copyright (c) 2008 University of Washington |
| // |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License version 2 as |
| // published by the Free Software Foundation; |
| // |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| // |
| |
| #include "ns3/names.h" |
| #include "ns3/node.h" |
| #include "ns3/log.h" |
| #include "ns3/simulator.h" |
| #include "ns3/object.h" |
| #include "ns3/packet.h" |
| #include "ns3/net-device.h" |
| #include "ns3/ipv4-route.h" |
| #include "ipv4-global-routing-unordered-nexthops.h" |
| |
| #include <iomanip> |
| |
| #ifndef UINT32_MAX |
| # define UINT32_MAX (4294967295U) |
| #endif |
| |
| NS_LOG_COMPONENT_DEFINE ("Ipv4GlobalRoutingUnorderedNexthops"); |
| |
| namespace ns3 { |
| |
| NS_OBJECT_ENSURE_REGISTERED (Ipv4GlobalRoutingUnorderedNexthops); |
| |
| TypeId |
| Ipv4GlobalRoutingUnorderedNexthops::GetTypeId (void) |
| { |
| static TypeId tid = TypeId ("ns3::Ipv4GlobalRoutingUnorderedNexthops") |
| .SetParent<Ipv4GlobalRouting> () |
| .AddConstructor<Ipv4GlobalRoutingUnorderedNexthops> () |
| ; |
| return tid; |
| } |
| |
| Ipv4GlobalRoutingUnorderedNexthops::Ipv4GlobalRoutingUnorderedNexthops () |
| : m_numLogicalEntries (1) |
| { |
| } |
| |
| void |
| Ipv4GlobalRoutingUnorderedNexthops::FixRoutes () |
| { |
| for (Ipv4AddressTrieMap::iterator route = m_routes.begin (); |
| route != m_routes.end (); |
| route ++) |
| { |
| if (route->second->size () < m_numLogicalEntries) |
| { |
| NS_LOG_WARN ("Not all entries got a new routing entry. Making one based on previous set"); |
| route->second->push_back (route->second->back ()); |
| route->second->back ().SetMetric (UINT32_MAX); // just to ensure we have consistency across the sets |
| } |
| } |
| m_numLogicalEntries ++; |
| } |
| |
| void |
| Ipv4GlobalRoutingUnorderedNexthops::AddRouteTo (Ipv4Address dest, |
| Ipv4Mask destMask, |
| Ipv4Address nextHop, |
| uint32_t interface, |
| uint32_t metric/*=0*/) |
| { |
| NS_LOG_FUNCTION (dest << destMask << nextHop << interface << metric); |
| |
| // First, make sure we don't try to add route to ourselves |
| int32_t iface = m_ipv4->GetInterfaceForPrefix (dest, destMask); |
| NS_LOG_LOGIC ("Iface " << iface << " for " << dest); |
| if (destMask != Ipv4Mask::GetZero () && iface >= 0) |
| { |
| NS_LOG_LOGIC ("Do not add route to ourselves"); |
| return; |
| } |
| |
| // Second, there is no reason to add p2p route that equals to the next hop |
| if (destMask == Ipv4Mask::GetOnes () && dest == nextHop) |
| { |
| NS_LOG_LOGIC ("Ignore route to nexthop via nexhop"); |
| return; |
| } |
| |
| Ptr<EntryContainer> nextHops = 0; |
| |
| Ipv4AddressTrieMap::iterator route = |
| m_routes.find (dest.CombineMask (destMask)); |
| if (route == m_routes.end ()) |
| { |
| nextHops = Create<EntryContainer> (); |
| m_routes[dest.CombineMask (destMask)] = nextHops; |
| } |
| else |
| { |
| nextHops = route->second; |
| } |
| |
| // NS_LOG_ERROR ("numLogicalEntries: " << m_numLogicalEntries << ", nextHops->size: " << nextHops->size ()); |
| NS_ASSERT_MSG (nextHops->size ()==m_numLogicalEntries || |
| nextHops->size ()==m_numLogicalEntries-1, |
| "Number of entries in nextHops should be either equal to number of logical entries, or one smaller"); |
| |
| if (nextHops->size ()==m_numLogicalEntries-1) |
| { |
| // new entry |
| nextHops->push_back (Ipv4RoutingTableEntry::CreateNetworkRouteTo (dest, destMask, nextHop, interface, metric)); |
| } |
| else |
| { |
| if (nextHops->back ().GetMetric () > metric) |
| { |
| // update entry if new metric is smaller |
| nextHops->back () = Ipv4RoutingTableEntry::CreateNetworkRouteTo (dest, destMask, nextHop, interface, metric); |
| } |
| } |
| } |
| |
| Ptr<Ipv4Route> |
| Ipv4GlobalRoutingUnorderedNexthops::LookupGlobal (uint32_t entryNum, Ipv4Address dest, Ptr<NetDevice> oif) |
| { |
| NS_LOG_FUNCTION_NOARGS (); |
| NS_LOG_LOGIC ("Looking for route for destination " << dest); |
| |
| NS_ASSERT_MSG (m_numLogicalEntries > 0, |
| "Number of logical entries should be at least one"); |
| |
| NS_ASSERT_MSG (entryNum < m_numLogicalEntries, |
| "Number of requested logical entry should be smaller than total number of logical entries"); |
| |
| Ipv4AddressTrieMap::const_iterator longest_prefix_map = m_routes.longest_prefix_match (dest); |
| if (longest_prefix_map == m_routes.end ()) |
| { |
| return 0; |
| } |
| |
| const Ipv4RoutingTableEntry & entry = (*longest_prefix_map->second)[entryNum]; |
| |
| if (oif != 0 && oif == m_ipv4->GetNetDevice (entry.GetInterface ())) |
| { |
| NS_LOG_LOGIC ("Route points to the incoming interface. Return empty route"); |
| return 0; |
| } |
| |
| // create a Ipv4Route object from the selected routing table entry |
| Ptr<Ipv4Route> rtentry = Create<Ipv4Route> (); |
| rtentry->SetDestination (entry.GetDest ()); |
| rtentry->SetSource (m_ipv4->GetAddress (entry.GetInterface (), 0).GetLocal ()); |
| rtentry->SetGateway (entry.GetGateway ()); |
| rtentry->SetOutputDevice (m_ipv4->GetNetDevice (entry.GetInterface ())); |
| return rtentry; |
| } |
| |
| void |
| Ipv4GlobalRoutingUnorderedNexthops::DeleteRoutes () |
| { |
| m_routes.clear (); |
| } |
| |
| void |
| Ipv4GlobalRoutingUnorderedNexthops::PrintRoutingTable (Ptr<OutputStreamWrapper> stream) const |
| { |
| std::ostream* os = stream->GetStream (); |
| if (m_routes.size () > 0) |
| { |
| *os << "Destination Iface(Metric),...,Iface(Metric)" << std::endl; |
| for (Ipv4AddressTrieMap::const_iterator i=m_routes.begin (); i != m_routes.end (); i++) |
| { |
| if (i->second->size ()==0) continue; |
| const Ipv4RoutingTableEntry &route = i->second->front (); |
| |
| std::ostringstream dest; |
| dest << route.GetDest () << "/" << route.GetDestNetworkMask().GetPrefixLength (); |
| *os << std::setiosflags (std::ios::left) << std::setw (15) << dest.str (); |
| |
| for (EntryContainer::iterator entry = i->second->begin (); |
| entry != i->second->end (); |
| entry ++) |
| { |
| if (entry != i->second->begin ()) |
| *os << ","; |
| *os << entry->GetInterface () << "(" << entry->GetMetric () << ")"; |
| } |
| |
| *os << std::endl; |
| } |
| } |
| } |
| |
| Ptr<Ipv4Route> |
| Ipv4GlobalRoutingUnorderedNexthops::RouteOutput (Ptr<Packet> p, const Ipv4Header &header, |
| Ptr<NetDevice> oif, Socket::SocketErrno &sockerr) |
| { |
| // |
| // First, see if this is a multicast packet we have a route for. If we |
| // have a route, then send the packet down each of the specified interfaces. |
| // |
| if (header.GetDestination ().IsMulticast ()) |
| { |
| NS_LOG_LOGIC ("Multicast destination-- returning false"); |
| return 0; // Let other routing protocols try to handle this |
| } |
| // |
| // See if this is a unicast packet we have a route for. |
| // |
| NS_LOG_LOGIC ("Unicast destination- looking up"); |
| Ptr<Ipv4Route> rtentry = LookupGlobal (0, header.GetDestination (), oif); |
| if (rtentry) |
| { |
| sockerr = Socket::ERROR_NOTERROR; |
| } |
| else |
| { |
| sockerr = Socket::ERROR_NOROUTETOHOST; |
| } |
| return rtentry; |
| } |
| |
| bool |
| Ipv4GlobalRoutingUnorderedNexthops::RouteInput (Ptr<const Packet> p, const Ipv4Header &header, |
| Ptr<const NetDevice> idev, |
| UnicastForwardCallback ucb, MulticastForwardCallback mcb, |
| LocalDeliverCallback lcb, ErrorCallback ecb) |
| { |
| |
| NS_LOG_FUNCTION (this << p << header << header.GetSource () << header.GetDestination () << idev); |
| // Check if input device supports IP |
| NS_ASSERT (m_ipv4->GetInterfaceForDevice (idev) >= 0); |
| uint32_t iif = m_ipv4->GetInterfaceForDevice (idev); |
| |
| if (header.GetDestination ().IsMulticast ()) |
| { |
| NS_LOG_LOGIC ("Multicast destination-- returning false"); |
| return false; // Let other routing protocols try to handle this |
| } |
| |
| if (header.GetDestination ().IsBroadcast ()) |
| { |
| NS_LOG_LOGIC ("For me (Ipv4Addr broadcast address)"); |
| // TODO: Local Deliver for broadcast |
| // TODO: Forward broadcast |
| } |
| |
| // TODO: Configurable option to enable RFC 1222 Strong End System Model |
| // Right now, we will be permissive and allow a source to send us |
| // a packet to one of our other interface addresses; that is, the |
| // destination unicast address does not match one of the iif addresses, |
| // but we check our other interfaces. This could be an option |
| // (to remove the outer loop immediately below and just check iif). |
| for (uint32_t j = 0; j < m_ipv4->GetNInterfaces (); j++) |
| { |
| for (uint32_t i = 0; i < m_ipv4->GetNAddresses (j); i++) |
| { |
| Ipv4InterfaceAddress iaddr = m_ipv4->GetAddress (j, i); |
| Ipv4Address addr = iaddr.GetLocal (); |
| if (addr.IsEqual (header.GetDestination ())) |
| { |
| if (j == iif) |
| { |
| NS_LOG_LOGIC ("For me (destination " << addr << " match)"); |
| } |
| else |
| { |
| NS_LOG_LOGIC ("For me (destination " << addr << " match) on another interface " << header.GetDestination ()); |
| } |
| lcb (p, header, iif); |
| return true; |
| } |
| if (header.GetDestination ().IsEqual (iaddr.GetBroadcast ())) |
| { |
| NS_LOG_LOGIC ("For me (interface broadcast address)"); |
| lcb (p, header, iif); |
| return true; |
| } |
| NS_LOG_LOGIC ("Address "<< addr << " not a match"); |
| } |
| } |
| // Check if input device supports IP forwarding |
| if (m_ipv4->IsForwarding (iif) == false) |
| { |
| NS_LOG_LOGIC ("Forwarding disabled for this interface"); |
| ecb (p, header, Socket::ERROR_NOROUTETOHOST); |
| return false; |
| } |
| // Next, try to find a route |
| NS_LOG_LOGIC ("Unicast destination- looking up global route"); |
| Ptr<Ipv4Route> rtentry = LookupGlobal (0, header.GetDestination ()); |
| if (rtentry != 0) |
| { |
| NS_LOG_LOGIC ("Found unicast destination- calling unicast callback"); |
| ucb (rtentry, p, header); |
| return true; |
| } |
| else |
| { |
| NS_LOG_LOGIC ("Did not find unicast destination- returning false"); |
| return false; // Let other routing protocols try to handle this |
| // route request. |
| } |
| } |
| |
| } // namespace ns3 |