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refactor arp handling

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This commit is contained in:
stubbfel
2015-08-27 23:20:40 +02:00
parent 82850cc822
commit 7560b71e92
3 changed files with 67 additions and 60 deletions
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99
src/map/natmap.cpp
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@@ -24,13 +24,14 @@ namespace otonat {
}
void NatMap::handlePdu(const Tins::PDU * pdu) {
Tins::PDU * pduCopy = pdu->clone();
if (pdu == NULL) {
if (pdu == nullptr) {
return;
}
Tins::PDU * pduCopy = pdu->clone();
delete pdu;
Tins::ARP * arp = pduCopy->find_pdu<Tins::ARP>();
if (arp != 0) {
if (arp != nullptr) {
if (handleArp(arp)) {
outgoingPduQueue.push(pduCopy);
}
@@ -38,7 +39,7 @@ namespace otonat {
}
Tins::IP * ip = pduCopy->find_pdu<Tins::IP>();
if (ip != 0) {
if (ip != nullptr) {
if (handleIp(ip, pduCopy)) {
outgoingPduQueue.push(pduCopy);
}
@@ -71,11 +72,11 @@ namespace otonat {
return true;
} else {
const Tins::EthernetII * eth = originPDU->find_pdu<Tins::EthernetII>();
if (eth != 0){
if (eth != nullptr) {
Tins::EthernetII fakeArp = Tins::ARP::make_arp_request(ip->dst_addr(), ip->src_addr(), eth->src_addr());
SendTranslatedArpRequest(originPDU->find_pdu<Tins::ARP>());
SendTranslatedArpRequest(fakeArp.find_pdu<Tins::ARP>());
}
return false;
}
}
@@ -143,7 +144,7 @@ namespace otonat {
if (isForMeOrFromMeArp(arp)) {
return false;
}
switch (arp->opcode()) {
case Tins::ARP::REQUEST:
return this->handleArpReq(arp);
@@ -181,7 +182,7 @@ namespace otonat {
bool NatMap::isIpInMyRanges(const Tins::IPv4Address & ipAddr, const NatRangeList & rangeList) {
for (NatRange range : rangeList) {
if (range.calcIpRange(true).contains(ipAddr)) {
if (range.calcIpRange(false).contains(ipAddr)) {
return true;
}
}
@@ -190,53 +191,57 @@ namespace otonat {
}
bool NatMap::handleArpReq(Tins::ARP* arp) {
Tins::IPv4Address targetIp = arp->target_ip_addr();
Tins::IPv4Address senderIp = arp->sender_ip_addr();
Tins::IPv4Address targetIp = arp->target_ip_addr();
IpAdressMap::const_iterator transTargetIpIter = this->transMap.find(targetIp);
if (transTargetIpIter != transMap.end()) {
Tins::IPv4Address transTargetIp = transTargetIpIter->second;
arp->target_ip_addr(transTargetIp);
IpAdressMap::const_iterator transSenderIpIter = this->transMap.find(senderIp);
if (transSenderIpIter != transMap.end()) {
arp->sender_ip_addr(transSenderIpIter->second);
return true;
} else {
for (NatRange & range : this->ranges) {
const Tins::NetworkInterface::Info & interfaceInfo = range.interface.info();
if (!interfaceInfo.is_up) {
continue;
}
Tins::IPv4Range ipRange = range.calcIpRange(true);
if (!ipRange.contains(transTargetIp)) {
continue;
}
Tins::IPv4Address transSenderIp = range.mapIPv4Addres(senderIp, true);
arp->sender_ip_addr(transSenderIp);
IpAdressMap::const_iterator transSenderIpReqIter = this->reqIpMap.find(transSenderIp);
if (transSenderIpReqIter == reqIpMap.end()) {
this->reqIpMap.insert(IPv4AddressEntry(transSenderIp, senderIp));
}
return true;
}
}
if (transTargetIpIter == transMap.end()) {
SendTranslatedArpRequest(arp);
return false;
}
SendTranslatedArpRequest(arp);
return false;
Tins::IPv4Address transTargetIp = transTargetIpIter->second;
arp->target_ip_addr(transTargetIp);
IpAdressMap::const_iterator transSenderIpIter = this->transMap.find(arp->sender_ip_addr());
if (transSenderIpIter != transMap.end()) {
arp->sender_ip_addr(transSenderIpIter->second);
return false;
}
return handleArpAndTranslateSenderIp(arp);
}
bool NatMap::handleArpReply(Tins::ARP* arp) {
return false;
}
void NatMap::SendTranslatedArpRequest(const Tins::ARP * arp){
Tins::IPv4Address targetIp = arp->target_ip_addr();
bool NatMap::handleArpAndTranslateSenderIp(Tins::ARP* arp) {
for (NatRange & range : this->ranges) {
const Tins::NetworkInterface::Info & interfaceInfo = range.interface.info();
if (!interfaceInfo.is_up) {
continue;
}
Tins::IPv4Range ipRange = range.calcIpRange(true);
if (!ipRange.contains(arp->target_ip_addr())) {
continue;
}
Tins::IPv4Address senderIp = arp->sender_ip_addr();
Tins::IPv4Address transSenderIp = range.mapIPv4Addres(senderIp, true);
arp->sender_ip_addr(transSenderIp);
IpAdressMap::const_iterator transSenderIpReqIter = this->reqIpMap.find(transSenderIp);
if (transSenderIpReqIter == reqIpMap.end()) {
this->reqIpMap.insert(IPv4AddressEntry(transSenderIp, senderIp));
}
return true;
}
return false;
}
void NatMap::SendTranslatedArpRequest(const Tins::ARP * arp) {
Tins::IPv4Address targetIp = arp->target_ip_addr();
for (NatRange & range : this->ranges) {
const Tins::NetworkInterface::Info & interfaceInfo = range.interface.info();
if (!interfaceInfo.is_up) {
@@ -260,7 +265,7 @@ namespace otonat {
if (transTargetIpReqIter == reqIpMap.end()) {
this->reqIpMap.insert(IPv4AddressEntry(transTargetIp, targetIp));
}
Tins::EthernetII transArp = Tins::ARP::make_arp_request(transTargetIp, transSenderIp, arp->sender_hw_addr());
outgoingPduQueue.push(transArp.clone());
}

1
src/map/natmap.h
View File

@@ -38,6 +38,7 @@ namespace otonat {
bool handleArp(Tins::ARP * arp);
bool handleArpReq(Tins::ARP * arp);
bool handleArpReply(Tins::ARP * arp);
bool handleArpAndTranslateSenderIp(Tins::ARP* arp);
Tins::IPv4Address InsertOrUdpateTranslateIpAddress(const Tins::IPv4Address & originIp, const NatRange & range);
Tins::IPv4Address InsertOrUdpateTranslateIpAddress(const Tins::IPv4Address & originIp, const Tins::IPv4Address & transIp, NatRangeList & rangeList);
void TranslateIpPacket(Tins::IP * ip, const Tins::IPv4Address & transIp);