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Allow ARP resolution to work with broadcast IPv4 (dest=255.255.255.255) packets; Partially fixes bug #36.

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This commit is contained in:
Gustavo J. A. M. Carneiro
2007-07-26 12:12:51 +01:00
parent 41c4b6453a
commit 1da64ebbd6
3 changed files with 38 additions and 1 deletions
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2
src/internet-node/arp-cache.cc
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@@ -109,6 +109,8 @@ ArpCache::Lookup (Ipv4Address to)
ArpCache::Entry *
ArpCache::Add (Ipv4Address to)
{
NS_ASSERT (m_arpCache.find (to) == m_arpCache.end ());
ArpCache::Entry *entry = new ArpCache::Entry (this);
m_arpCache[to] = entry;
return entry;

15
src/internet-node/arp-ipv4-interface.cc
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@@ -21,6 +21,7 @@
*/
#include "ns3/packet.h"
#include "ns3/debug.h"
#include "ns3/composite-trace-resolver.h"
#include "ns3/node.h"
#include "ns3/net-device.h"
@@ -60,7 +61,19 @@ ArpIpv4Interface::SendTo (Packet p, Ipv4Address dest)
{
Ptr<ArpPrivate> arp = m_node->QueryInterface<ArpPrivate> (ArpPrivate::iid);
MacAddress hardwareDestination;
bool found = arp->Lookup (p, dest, GetDevice (), &hardwareDestination);
bool found;
if (dest.IsBroadcast ())
{
hardwareDestination = GetDevice ()->GetBroadcast ();
found = true;
}
else
{
Ptr<ArpPrivate> arp = m_node->QueryInterface<ArpPrivate> (ArpPrivate::iid);
found = arp->Lookup (p, dest, GetDevice (), &hardwareDestination);
}
if (found)
{
GetDevice ()->Send (p, hardwareDestination, Ipv4L3Protocol::PROT_NUMBER);

22
src/internet-node/arp-l3-protocol.cc
View File

@@ -87,6 +87,13 @@ ArpL3Protocol::Receive(Packet& packet, Ptr<NetDevice> device)
ArpCache *cache = FindCache (device);
ArpHeader arp;
packet.RemoveHeader (arp);
NS_DEBUG ("ARP: received "<< (arp.IsRequest ()? "request" : "reply") <<
" node="<<m_node->GetId ()<<", got request from " <<
arp.GetSourceIpv4Address () << " for address " <<
arp.GetDestinationIpv4Address () << "; we have address " <<
cache->GetInterface ()->GetAddress ());
if (arp.IsRequest () &&
arp.GetDestinationIpv4Address () == cache->GetInterface ()->GetAddress ())
{
@@ -128,6 +135,12 @@ ArpL3Protocol::Receive(Packet& packet, Ptr<NetDevice> device)
// XXX report packet as dropped.
}
}
else
{
NS_DEBUG ("node="<<m_node->GetId ()<<", got request from " <<
arp.GetSourceIpv4Address () << " for unknown address " <<
arp.GetDestinationIpv4Address () << " -- drop");
}
}
bool
ArpL3Protocol::Lookup (Packet &packet, Ipv4Address destination,
@@ -203,6 +216,11 @@ void
ArpL3Protocol::SendArpRequest (ArpCache const *cache, Ipv4Address to)
{
ArpHeader arp;
NS_DEBUG ("ARP: sending request from node "<<m_node->GetId ()<<
" || src: " << cache->GetDevice ()->GetAddress () <<
" / " << cache->GetInterface ()->GetAddress () <<
" || dst: " << cache->GetDevice ()->GetBroadcast () <<
" / " << to);
arp.SetRequest (cache->GetDevice ()->GetAddress (),
cache->GetInterface ()->GetAddress (),
cache->GetDevice ()->GetBroadcast (),
@@ -216,6 +234,10 @@ void
ArpL3Protocol::SendArpReply (ArpCache const *cache, Ipv4Address toIp, MacAddress toMac)
{
ArpHeader arp;
NS_DEBUG ("ARP: sending reply from node "<<m_node->GetId ()<<
"|| src: " << cache->GetDevice ()->GetAddress () <<
" / " << cache->GetInterface ()->GetAddress () <<
" || dst: " << toMac << " / " << toIp);
arp.SetReply (cache->GetDevice ()->GetAddress (),
cache->GetInterface ()->GetAddress (),
toMac, toIp);