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VirtualNetworkSwitch.cpp
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VirtualNetworkSwitch.cpp
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#include "VirtualNetworkSwitch.h"
#include "OFHello.h"
#include "OFEchoReq.h"
#include "OFPacketIn.h"
#include "OFFeatureRes.h"
#include "OFMultipartRes.h"
#include "OFPortStatus.h"
#include "OFError.h"
#include "FlowModFactory.h"
#include "ActionFactory.h"
#include "string.h"
#include "NetworkUtils.h"
#include "PacketOutFactory.h"
#include "logger.h"
#include "json/JSON.h"
#define COOKIE_FLOW_DHCP 1
#define COOKIE_FLOW_ARP 2
#define TUNNEL_PORT 65279
#define OVS_TUN_CMD "ovs-vsctl add-port <bridgename> vtun1 -- set interface vtun1 type=vxlan options:remote_ip=flow options:key=flow ofport_request=65279"
/*
To create a flow-based vxlan tunnel: ovs-vsctl add-port sw1 vtun1 -- set interface vtun1 type=vxlan options:remote_ip=flow options:key=flow ofport_request=65279
The port number is set to 65279 because that is how the controller recognizes the tunnel port.
the "remote_ip=flow" part will allow flows to set the field tun_dst before outputing
on the port. keys=flow allows us to set the the field tunnel_id, which is the VNI.
setting tun_dst is not documented in the OF1.3 spec. It is a Nicira extension.
You can set it with the action set_field containing a OXM with that field
but using the NXM oclass
*/
VirtualNetworkSwitch::VirtualNetworkSwitch(ResponseHandler* rh, Topology* t, EventScheduler *es): OpenFlowSwitch(rh)
{
this->eventScheduler = es;
this->topology = t;
this->addHandler(new OFHello());
this->addHandler(new OFError());
this->addHandler(new OFEchoReq());
this->addHandler(new OFPacketIn());
this->addHandler(new OFFeatureRes());
this->addHandler(new OFPortStatus());
this->addHandler(new OFMultipartRes());
this->dhcpServer = new DHCPServer();
this->arpService = new ARPService();
}
VirtualNetworkSwitch::~VirtualNetworkSwitch()
{
delete this->dhcpServer;
}
void VirtualNetworkSwitch::onFeatureResponse(u64 dataPathId)
{
if (this->initialized)
{
LOG("Received FeatureRequestResponse when already initialized. Should handle that");
return;
}
this->setDataPathId(__builtin_bswap64(dataPathId));
OFSetConfigMessage c;
u16 size = sizeof(OFSetConfigMessage);
buildMessageHeader((OFMessage*)&c, OpenFlowMessageType::SetConfig,this->getXid());
c.header.length = __builtin_bswap16(size);
c.flags = 0;
c.missSendLen = __builtin_bswap16(0xFF);
this->responseHandler->sendMessage((OFMessage*)&c,size);
// Request ports list
OFMultipartReqMessage mp;
size = sizeof(OFMultipartReqMessage);
buildMessageHeader((OFMessage*)&mp, OpenFlowMessageType::MultipartReq,this->getXid());
mp.header.length = __builtin_bswap16(size);
mp.type = __builtin_bswap16((u16)OpenFlowMultiPartTypes::PortDesc); // PortDescription
mp.flags = 0;
this->responseHandler->sendMessage((OFMessage*)&mp,size);
// We wanna make sure we start fresh, Send a Flowmod to delete all flows
this->clearFlows(0);
this->clearFlows(1);
this->clearFlows(2);
this->clearFlows(3);
this->clearFlows(4);
this->setTable0DefaultFlow();
this->setTable2DefaultFlow();
this->setTable1TunnelFlow();
NewSwitchEvent ev;
ev.obj = this;
this->eventScheduler->send(&ev);
this->onInitComplete();
}
void VirtualNetworkSwitch::onPacketIn(EthernetFrame* eth, u16 size, MatchReader* mr, u8 table, u32 bufferId, u64 cookie)
{
u32 inPort = mr->getInPort();
if (cookie == COOKIE_FLOW_DHCP)
{
u8* response;
u16 responseSize;
std::tie(responseSize,response) = this->dhcpServer->makeDHCPResponse((DHCPFullMessage*)eth,
[this](MacAddress src, u32& ip, u32& mask, u32& gw, u32& dns){
Host* h = this->topology->findHostByMac(src);
Network* net = this->topology->getNetworkForHost(h);
if (!h || !net ) return false;
ip = h->ip;
mask = net->mask;
gw = net->gateway;
dns = net->dns;
return true;
});
if (response)
{
PacketOutFactory pof;
ActionFactory af;
pof.setData(response,responseSize);
pof.addAction(af.createOutputAction((u32)OpenFlowPort::Ingress,0xFFFF));
OFPacketOutMessage* pom = pof.getMessage(this->getXid(), 0xFFFF, inPort);
this->responseHandler->sendMessage((OFMessage*)pom,__builtin_bswap16(pom->header.length));
}
}
else if (cookie == COOKIE_FLOW_ARP)
{
u8* response;
u16 responseSize;
std::tie(responseSize,response) = this->arpService->makeARPResponse((ARPFullMessage*)eth,
[this](MacAddress src, u32 target, MacAddress& reply){
Host* h = this->topology->findHostByMac(src);
Network* net = this->topology->getNetworkForHost(h);
if (!h || !net ) return false;
std::vector<Host*> hosts = this->topology->getHostsInNetwork(net);
for (auto& it : hosts)
{
if (it->ip == target)
{
reply = it->mac;
return true;
}
}
if (target == net->gateway)
{
Router* router = this->topology->getRouterForNetwork(net);
if (router)
{
reply = router->mac;
return true;
}
}
return false;
});
if (response)
{
PacketOutFactory pof;
ActionFactory af;
pof.setData(response,responseSize);
pof.addAction(af.createOutputAction((u32)OpenFlowPort::Ingress,0xFFFF));
OFPacketOutMessage* pom = pof.getMessage(this->getXid(), 0xFFFF, inPort);
this->responseHandler->sendMessage((OFMessage*)pom,__builtin_bswap16(pom->header.length));
}
}
else
{
LOG("Warning: Got PacketIn from port " << inPort << " with cookie " <<std::hex << cookie);
}
}
void VirtualNetworkSwitch::onPortChanged(OFPort* p, PortChangeOperation op, bool moreToCome)
{
u16 portId = __builtin_bswap32(p->id);
std::string name;
name.assign(p->name,strnlen(p->name,16));
u32 portConfig = __builtin_bswap32(p->config);
u32 portState = __builtin_bswap32(p->state);
SwitchPortState switchPortState = SwitchPortState::Down;
if ((portState == OF_PORT_STATE_STP_LISTEN) && (portConfig &(OF_PORT_CONFIG_PORT_DOWN))==0) switchPortState = SwitchPortState::Up;
switch (op)
{
case PortChangeOperation::Add:
{
this->addPort(portId, name);
this->setPortState(portId, switchPortState);
}
break;
case PortChangeOperation::Modify:
{
this->setPortState(portId, switchPortState);
}
break;
case PortChangeOperation::Delete:
{
this->removePort(portId);
}
break;
}
if (!moreToCome)
{
Dumais::JSON::JSON j;
this->toJson(j);
LOG("VirtualNetworkSwitch: \r\n\r\n"<<j.stringify(true));
if (!this->portExists(TUNNEL_PORT))
{
LOG("WARNING!!! No tunnel port found in switch. A vxlan tunnel with ID " << (int)TUNNEL_PORT << " must exist to "
"allow traffic to flow across bridges. Use the command: " << OVS_TUN_CMD);
}
}
}
void VirtualNetworkSwitch::clearFlows(u8 table)
{
FlowModFactory factory;
OFFlowModMessage* mod = factory.getMessage(3,this->getXid(),table,0,0);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setTable0DefaultFlow()
{
FlowModFactory factory;
factory.addGotoTableInstruction(1);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),0,0,0);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setDhcpRequestFlow(Host *h)
{
u8 tableId = 0;
u16 prio = 100;
FlowModFactory factory;
ActionFactory af;
// We don't need to install DHCP/ARP flows non local ports
if (h->bridge != this->getDataPathId()) return;
u32 inPortData = __builtin_bswap32(h->port);
u16 udpPortData = __builtin_bswap16(67);
u8 ipProtoData = 17;
u16 ethTypeData = __builtin_bswap16(0x0800);
u8 macData[6];
convertMacAddressToNetworkOrder(h->mac, (u8*)&macData[0]);
factory.addOXM(OpenFlowOXMField::InPort,(u8*)&inPortData,4);
factory.addOXM(OpenFlowOXMField::EthSrc,(u8*)&macData[0],6);
factory.addOXM(OpenFlowOXMField::EthType,(u8*)ðTypeData,2);
factory.addOXM(OpenFlowOXMField::IpProto,(u8*)&ipProtoData,1);
factory.addOXM(OpenFlowOXMField::UdpDst,(u8*)&udpPortData,2);
OFAction* sendToControllerAction = af.createOutputAction((u32)OpenFlowPort::Controller,0xFFFF);
factory.addApplyActionInstruction({sendToControllerAction});
factory.setCookie(COOKIE_FLOW_DHCP);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setArpReplyFlow(Host *h)
{
u8 tableId = 0;
u16 prio = 101;
FlowModFactory factory;
ActionFactory af;
// We don't need to install DHCP/ARP flows non local ports
if (h->bridge != this->getDataPathId()) return;
u32 inPortData = __builtin_bswap32(h->port);
u16 arpOpData = __builtin_bswap16(1);
u16 ethTypeData = __builtin_bswap16(0x0806);
u8 macData[6];
convertMacAddressToNetworkOrder(h->mac, (u8*)&macData[0]);
factory.addOXM(OpenFlowOXMField::InPort,(u8*)&inPortData,4);
factory.addOXM(OpenFlowOXMField::EthSrc,(u8*)&macData[0],6);
factory.addOXM(OpenFlowOXMField::EthType,(u8*)ðTypeData,2);
factory.addOXM(OpenFlowOXMField::ArpOp,(u8*)&arpOpData,2);
OFAction* sendToControllerAction = af.createOutputAction((u32)OpenFlowPort::Controller,0xFFFF);
factory.addApplyActionInstruction({sendToControllerAction});
factory.setCookie(COOKIE_FLOW_ARP);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
// For all local ports, we add a flow in t1 that
// sets the tunnel_id to the netId and then jump to t2
void VirtualNetworkSwitch::setNetTaggingFlow(Host *h)
{
u8 tableId = 1;
u16 prio = 300;
// We don't need to install DHCP/ARP flows non local ports
if (h->bridge != this->getDataPathId()) return;
FlowModFactory factory;
ActionFactory af;
u32 inPortData = __builtin_bswap32(h->port);
u32 srcIP = h->ip;
u16 ethTypeData = __builtin_bswap16(0x0800);
u8 macDataSrc[6];
convertMacAddressToNetworkOrder(h->mac, (u8*)&macDataSrc[0]);
factory.addOXM(OpenFlowOXMField::InPort,(u8*)&inPortData,4);
factory.addOXM(OpenFlowOXMField::EthSrc,(u8*)&macDataSrc[0],6);
factory.addOXM(OpenFlowOXMField::EthType,(u8*)ðTypeData,2);
factory.addOXM(OpenFlowOXMField::IpSrc,(u8*)&srcIP,4);
OFAction* setTunIdAction = af.createSetTunIdAction(h->network);
factory.addApplyActionInstruction({setTunIdAction});
factory.addGotoTableInstruction(2);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setTable1TunnelFlow()
{
u8 tableId = 1;
u16 prio = 200;
FlowModFactory factory;
ActionFactory af;
u32 inPortData = __builtin_bswap32(TUNNEL_PORT);
factory.addOXM(OpenFlowOXMField::InPort,(u8*)&inPortData,4);
// When comming from tunnel, we can jump directly to the host forwarding flow
factory.addGotoTableInstruction(3);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setTable2DefaultFlow()
{
FlowModFactory factory;
u8 tableId = 2;
factory.addGotoTableInstruction(3);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,0,0);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setTable2GatewayFlows(Network* src, Network *dst, MacAddress gw)
{
u8 tableId = 2;
u16 prio = 100;
u8 macData[6];
convertMacAddressToNetworkOrder(gw, (u8*)&macData[0]);
u16 ethTypeData = __builtin_bswap16(0x0800);
struct
{
u32 ip;
u32 mask;
} dstIP;
dstIP.ip = dst->networkAddress;
dstIP.mask = dst->mask;
ActionFactory af;
FlowModFactory factory;
u64 srcTunId = __builtin_bswap64(src->id);
factory.addOXM(OpenFlowOXMField::TunnelId,(u8*)&srcTunId,8);
factory.addOXM(OpenFlowOXMField::EthDst,(u8*)&macData[0],6);
factory.addOXM(OpenFlowOXMField::EthType,(u8*)ðTypeData,2);
factory.addOXM(OpenFlowOXMField::IpDst,(u8*)&dstIP,8,true);
OFAction* setTunIdAction = af.createSetTunIdAction(dst->id);
OFAction* setSrcMacAction = af.createSetSrcMacAction((u8*)&macData[0]);
factory.addApplyActionInstruction({setSrcMacAction,setTunIdAction});
factory.addGotoTableInstruction(3);
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setTable3TunnelFlow(Host* h)
{
u8 tableId = 3;
u16 prio = 400;
FlowModFactory factory;
ActionFactory af;
// Only do this for remote hosts
if (h->bridge == this->getDataPathId()) return;
u16 ethTypeData = __builtin_bswap16(0x0800);
u32 dstIP = h->ip;
//u8 macData[6];
//convertMacAddressToNetworkOrder(h->mac, (u8*)&macData[0]);
//factory.addOXM(OpenFlowOXMField::EthDst,(u8*)&macData[0],6);
u64 srcTunId = __builtin_bswap64(h->network);
factory.addOXM(OpenFlowOXMField::TunnelId,(u8*)&srcTunId,8);
factory.addOXM(OpenFlowOXMField::EthType,(u8*)ðTypeData,2);
factory.addOXM(OpenFlowOXMField::IpDst,(u8*)&dstIP,4);
u32 remoteIp = this->topology->getBridgeAddressForHost(h);
OFAction* setTunIdAction = af.createSetTunIdAction(h->network);
OFAction* setTunDstAction = af.createSetTunDstAction(__builtin_bswap32(remoteIp));
OFAction* outputAction = af.createOutputAction((u32)TUNNEL_PORT,0xFFFF);
factory.addApplyActionInstruction({setTunIdAction,setTunDstAction,outputAction});
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::setHostForwardFlow(Host *h)
{
u8 tableId = 3;
u16 prio = 300;
if (h->bridge != this->getDataPathId()) return;
FlowModFactory factory;
ActionFactory af;
u32 dstIP = h->ip;
u64 tunIdData = __builtin_bswap64(h->network);
u16 ethTypeData = __builtin_bswap16(0x0800);
u8 macDataDst[6];
convertMacAddressToNetworkOrder(h->mac, (u8*)&macDataDst[0]);
factory.addOXM(OpenFlowOXMField::EthType,(u8*)ðTypeData,2);
factory.addOXM(OpenFlowOXMField::IpDst,(u8*)&dstIP,4);
factory.addOXM(OpenFlowOXMField::TunnelId,(u8*)&tunIdData,8);
OFAction* setDstMacAction = af.createSetDstMacAction((u8*)&macDataDst[0]);
OFAction* outputAction = af.createOutputAction(h->port,0xFFFF);
factory.addApplyActionInstruction({setDstMacAction,outputAction});
OFFlowModMessage* mod = factory.getMessage(0,this->getXid(),tableId,prio,(u32)OpenFlowPort::Any);
u16 size = __builtin_bswap16(mod->header.length);
this->responseHandler->sendMessage((OFMessage*)mod,size);
delete mod;
}
void VirtualNetworkSwitch::toJson(Dumais::JSON::JSON& j)
{
OpenFlowSwitch::toJson(j);
}
void VirtualNetworkSwitch::onRouteChanged(Network* from, Network* to, MacAddress gw, bool added)
{
LOG("Router changed: " << added);
if (added)
{
setTable2GatewayFlows(from,to,gw);
}
}
void VirtualNetworkSwitch::onHostChanged(Host* o, bool added)
{
LOG("Host changed: " << added);
if (added)
{
//TODO: We should add those flows only if the port of the host is up.
// If the VM is down (thus, port would be down?) we don't benefit from
// having those rules in place. It could probably give a performance gain to the switch
// if we set as less flows as possible
// Intercept DHCP requests from table 0
// The controller knows about all hosts that are allowed to be on the network
// So it knows what IP should be associated to which MAC.
setDhcpRequestFlow(o);
// Intercept ARP requests from table 0
// The controller knows about all hosts that are allowed to be on the network
// So it is able to respond to ARP queries
setArpReplyFlow(o);
// Set the t1 flow that will set the tun_id and jump to t2
setNetTaggingFlow(o);
// Table 2 contains a flow for every known hosts across the whole
// system
setHostForwardFlow(o);
setTable3TunnelFlow(o);
}
}
void VirtualNetworkSwitch::onNetworkChanged(Network* o, bool added)
{
LOG("Network changed: " << added);
}
void VirtualNetworkSwitch::onBridgeChanged(Bridge* o, bool added)
{
LOG("Bridge changed: " << added);
}