func (r *L2Switch) OnTopologyChange(finder network.Finder) error {
r.log.Debug("L2Switch: OnTopologyChange..")
// We should remove all edges from all switch devices when the network topology is changed.
// Otherwise, installed flow rules in switches may result in incorrect packet routing based on the previous topology.
if err := r.removeAllFlows(finder.Devices()); err != nil {
return err
}
return r.BaseProcessor.OnTopologyChange(finder)
}
func (r *ProxyARP) broadcastARPAnnouncement(finder network.Finder, vips []VIP) {
for _, v := range vips {
for _, d := range finder.Devices() {
if err := d.SendARPAnnouncement(v.Address, v.MAC); err != nil {
r.log.Err(fmt.Sprintf("ProxyARP: failed to broadcast ARP announcement: %v", err))
continue
}
}
r.log.Info(fmt.Sprintf("ProxyARP: toggled VIP %v to %v", v.Address, v.MAC))
}
}
func (r *L2Switch) processPacket(finder network.Finder, ingress *network.Port, eth *protocol.Ethernet) (drop bool, err error) {
r.log.Debug(fmt.Sprintf("L2Switch: PACKET_IN.. Ingress=%v, SrcMAC=%v, DstMAC=%v", ingress.ID(), eth.SrcMAC, eth.DstMAC))
packet, err := eth.MarshalBinary()
if err != nil {
return false, err
}
// Broadcast?
if isBroadcast(eth) {
r.log.Debug(fmt.Sprintf("L2Switch: broadcasting.. SrcMAC=%v, DstMAC=%v", eth.SrcMAC, eth.DstMAC))
return true, r.stormCtrl.broadcast(ingress, packet)
}
dstNode, err := finder.Node(eth.DstMAC)
if err != nil {
return true, fmt.Errorf("locating a node (MAC=%v): %v", eth.DstMAC, err)
}
// Unknown node?
if dstNode == nil {
r.log.Debug(fmt.Sprintf("L2Switch: unknown node! dropping.. SrcMAC=%v, DstMAC=%v", eth.SrcMAC, eth.DstMAC))
return true, nil
}
// Disconnected node?
port := dstNode.Port().Value()
if port.IsPortDown() || port.IsLinkDown() {
r.log.Debug(fmt.Sprintf("L2Switch: disconnected node! dropping.. SrcMAC=%v, DstMAC=%v", eth.SrcMAC, eth.DstMAC))
return true, nil
}
param := switchParam{}
// Check whether src and dst nodes reside on a same switch device
if ingress.Device().ID() == dstNode.Port().Device().ID() {
param = switchParam{
finder: finder,
ethernet: eth,
ingress: ingress,
egress: dstNode.Port(),
rawPacket: packet,
}
} else {
path := finder.Path(ingress.Device().ID(), dstNode.Port().Device().ID())
if len(path) == 0 {
r.log.Debug(fmt.Sprintf("L2Switch: empty path.. dropping SrcMAC=%v, DstMAC=%v", eth.SrcMAC, eth.DstMAC))
return true, nil
}
egress := path[0][0]
// Drop this packet if it goes back to the ingress port to avoid duplicated packet routing
if ingress.Number() == egress.Number() {
r.log.Debug(fmt.Sprintf("L2Switch: ignore routing path that goes back to the ingress port (SrcMAC=%v, DstMAC=%v)", eth.SrcMAC, eth.DstMAC))
return true, nil
}
param = switchParam{
finder: finder,
ethernet: eth,
ingress: ingress,
egress: egress,
rawPacket: packet,
}
}
return true, r.switching(param)
}