func alreadySetUp(multitenant bool, localSubnetGatewayCIDR string) bool { var found bool exec := kexec.New() itx := ipcmd.NewTransaction(exec, LBR) addrs, err := itx.GetAddresses() itx.EndTransaction() if err != nil { return false } found = false for _, addr := range addrs { if addr == localSubnetGatewayCIDR { found = true break } } if !found { return false } otx := ovs.NewTransaction(exec, BR) flows, err := otx.DumpFlows() otx.EndTransaction() if err != nil { return false } found = false for _, flow := range flows { if !strings.Contains(flow, VERSION_TABLE) { continue } idx := strings.Index(flow, VERSION_ACTION) if idx < 0 { continue } // OVS note action format hex bytes separated by '.'; first // byte is plugin type (multi-tenant/single-tenant) and second // byte is flow rule version expected := getPluginVersion(multitenant) existing := strings.Split(flow[idx+len(VERSION_ACTION):], ".") if len(existing) >= 2 && existing[0] == expected[0] && existing[1] == expected[1] { found = true break } } if !found { return false } return true }
func (plugin *OsdnNode) DeleteHostSubnetRules(subnet *osapi.HostSubnet) error { glog.Infof("DeleteHostSubnetRules for %s", hostSubnetToString(subnet)) otx := ovs.NewTransaction(kexec.New(), BR) otx.DeleteFlows("table=1, tun_src=%s", subnet.HostIP) otx.DeleteFlows("table=8, nw_dst=%s", subnet.Subnet) err := otx.EndTransaction() if err != nil { return fmt.Errorf("Error deleting OVS flows for subnet: %v, %v", subnet, err) } return nil }
func (plugin *OsdnNode) AddHostSubnetRules(subnet *osapi.HostSubnet) error { glog.Infof("AddHostSubnetRules for %s", hostSubnetToString(subnet)) otx := ovs.NewTransaction(kexec.New(), BR) otx.AddFlow("table=1, priority=100, tun_src=%s, actions=goto_table:5", subnet.HostIP) otx.AddFlow("table=8, priority=100, arp, nw_dst=%s, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:%s->tun_dst,output:1", subnet.Subnet, subnet.HostIP) otx.AddFlow("table=8, priority=100, ip, nw_dst=%s, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:%s->tun_dst,output:1", subnet.Subnet, subnet.HostIP) err := otx.EndTransaction() if err != nil { return fmt.Errorf("Error adding OVS flows for subnet: %v, %v", subnet, err) } return nil }
func (plugin *OsdnNode) updateEgressNetworkPolicy(vnid uint32) error { otx := ovs.NewTransaction(kexec.New(), BR) policies := plugin.egressPolicies[vnid] namespaces := plugin.vnids.GetNamespaces(vnid) if len(policies) == 0 { otx.DeleteFlows("table=9, reg0=%d", vnid) } else if vnid == 0 { glog.Errorf("EgressNetworkPolicy in global network namespace is not allowed (%s); ignoring", policyNames(policies)) } else if len(namespaces) > 1 { glog.Errorf("EgressNetworkPolicy not allowed in shared NetNamespace (%s); dropping all traffic", strings.Join(namespaces, ", ")) otx.DeleteFlows("table=9, reg0=%d", vnid) otx.AddFlow("table=9, reg0=%d, priority=1, actions=drop", vnid) } else if len(policies) > 1 { glog.Errorf("multiple EgressNetworkPolicies in same network namespace (%s) is not allowed; dropping all traffic", policyNames(policies)) otx.DeleteFlows("table=9, reg0=%d", vnid) otx.AddFlow("table=9, reg0=%d, priority=1, actions=drop", vnid) } else /* vnid != 0 && len(policies) == 1 */ { // Temporarily drop all outgoing traffic, to avoid race conditions while modifying the other rules otx.AddFlow("table=9, reg0=%d, cookie=1, priority=65535, actions=drop", vnid) otx.DeleteFlows("table=9, reg0=%d, cookie=0/1", vnid) for i, rule := range policies[0].Spec.Egress { priority := len(policies[0].Spec.Egress) - i var action string if rule.Type == osapi.EgressNetworkPolicyRuleAllow { action = "output:2" } else { action = "drop" } var dst string if rule.To.CIDRSelector == "0.0.0.0/32" { dst = "" } else { dst = fmt.Sprintf(", nw_dst=%s", rule.To.CIDRSelector) } otx.AddFlow("table=9, reg0=%d, priority=%d, ip%s, actions=%s", vnid, priority, dst, action) } otx.DeleteFlows("table=9, reg0=%d, cookie=1/1", vnid) } err := otx.EndTransaction() if err != nil { return fmt.Errorf("Error updating OVS flows for EgressNetworkPolicy: %v", err) } return nil }
func (plugin *OsdnNode) DeleteServiceRules(service *kapi.Service) error { if !plugin.multitenant { return nil } glog.V(5).Infof("DeleteServiceRules for %v", service) otx := ovs.NewTransaction(kexec.New(), BR) for _, port := range service.Spec.Ports { otx.DeleteFlows(generateDeleteServiceRule(service.Spec.ClusterIP, port.Protocol, int(port.Port))) err := otx.EndTransaction() if err != nil { return fmt.Errorf("Error deleting OVS flows for service: %v, %v", service, err) } } return nil }
func (plugin *OsdnNode) AddServiceRules(service *kapi.Service, netID uint32) error { if !plugin.multitenant { return nil } glog.V(5).Infof("AddServiceRules for %v", service) otx := ovs.NewTransaction(kexec.New(), BR) for _, port := range service.Spec.Ports { otx.AddFlow(generateAddServiceRule(netID, service.Spec.ClusterIP, port.Protocol, int(port.Port))) err := otx.EndTransaction() if err != nil { return fmt.Errorf("Error adding OVS flows for service: %v, netid: %d, %v", service, netID, err) } } return nil }
func (plugin *OsdnNode) SetupSDN(localSubnetCIDR, clusterNetworkCIDR, servicesNetworkCIDR string, mtu uint32) (bool, error) { _, ipnet, err := net.ParseCIDR(localSubnetCIDR) localSubnetMaskLength, _ := ipnet.Mask.Size() localSubnetGateway := netutils.GenerateDefaultGateway(ipnet).String() glog.V(5).Infof("[SDN setup] node pod subnet %s gateway %s", ipnet.String(), localSubnetGateway) gwCIDR := fmt.Sprintf("%s/%d", localSubnetGateway, localSubnetMaskLength) if alreadySetUp(plugin.multitenant, gwCIDR) { glog.V(5).Infof("[SDN setup] no SDN setup required") return false, nil } glog.V(5).Infof("[SDN setup] full SDN setup required") mtuStr := fmt.Sprint(mtu) exec := kexec.New() itx := ipcmd.NewTransaction(exec, LBR) itx.SetLink("down") itx.IgnoreError() itx.DeleteLink() itx.IgnoreError() itx.AddLink("type", "bridge") itx.AddAddress(gwCIDR) itx.SetLink("up") err = itx.EndTransaction() if err != nil { glog.Errorf("Failed to configure docker bridge: %v", err) return false, err } defer deleteLocalSubnetRoute(LBR, localSubnetCIDR) glog.V(5).Infof("[SDN setup] docker setup %s mtu %s", LBR, mtuStr) out, err := exec.Command("openshift-sdn-docker-setup.sh", LBR, mtuStr).CombinedOutput() if err != nil { glog.Errorf("Failed to configure docker networking: %v\n%s", err, out) return false, err } else { glog.V(5).Infof("[SDN setup] docker setup success:\n%s", out) } config := fmt.Sprintf("export OPENSHIFT_CLUSTER_SUBNET=%s", clusterNetworkCIDR) err = ioutil.WriteFile("/run/openshift-sdn/config.env", []byte(config), 0644) if err != nil { return false, err } itx = ipcmd.NewTransaction(exec, VLINUXBR) itx.DeleteLink() itx.IgnoreError() itx.AddLink("mtu", mtuStr, "type", "veth", "peer", "name", VOVSBR, "mtu", mtuStr) itx.SetLink("up") itx.SetLink("txqueuelen", "0") err = itx.EndTransaction() if err != nil { return false, err } itx = ipcmd.NewTransaction(exec, VOVSBR) itx.SetLink("up") itx.SetLink("txqueuelen", "0") err = itx.EndTransaction() if err != nil { return false, err } itx = ipcmd.NewTransaction(exec, LBR) itx.AddSlave(VLINUXBR) err = itx.EndTransaction() if err != nil { return false, err } otx := ovs.NewTransaction(exec, BR) otx.AddBridge("fail-mode=secure", "protocols=OpenFlow13") otx.AddPort(VXLAN, 1, "type=vxlan", `options:remote_ip="flow"`, `options:key="flow"`) otx.AddPort(TUN, 2, "type=internal") otx.AddPort(VOVSBR, 3) // Table 0: initial dispatch based on in_port // vxlan0 otx.AddFlow("table=0, priority=200, in_port=1, arp, nw_src=%s, nw_dst=%s, actions=move:NXM_NX_TUN_ID[0..31]->NXM_NX_REG0[],goto_table:1", clusterNetworkCIDR, localSubnetCIDR) otx.AddFlow("table=0, priority=200, in_port=1, ip, nw_src=%s, nw_dst=%s, actions=move:NXM_NX_TUN_ID[0..31]->NXM_NX_REG0[],goto_table:1", clusterNetworkCIDR, localSubnetCIDR) otx.AddFlow("table=0, priority=150, in_port=1, actions=drop") // tun0 otx.AddFlow("table=0, priority=200, in_port=2, arp, nw_src=%s, nw_dst=%s, actions=goto_table:5", localSubnetGateway, clusterNetworkCIDR) otx.AddFlow("table=0, priority=200, in_port=2, ip, actions=goto_table:5") otx.AddFlow("table=0, priority=150, in_port=2, actions=drop") // vovsbr otx.AddFlow("table=0, priority=200, in_port=3, arp, nw_src=%s, actions=goto_table:5", localSubnetCIDR) otx.AddFlow("table=0, priority=200, in_port=3, ip, nw_src=%s, actions=goto_table:5", localSubnetCIDR) otx.AddFlow("table=0, priority=150, in_port=3, actions=drop") // else, from a container otx.AddFlow("table=0, priority=100, arp, actions=goto_table:2") otx.AddFlow("table=0, priority=100, ip, actions=goto_table:2") otx.AddFlow("table=0, priority=0, actions=drop") // Table 1: VXLAN ingress filtering; filled in by AddHostSubnetRules() // eg, "table=1, priority=100, tun_src=${remote_node_ip}, actions=goto_table:5" otx.AddFlow("table=1, priority=0, actions=drop") // Table 2: from OpenShift container; validate IP/MAC, assign tenant-id; filled in by openshift-sdn-ovs // eg, "table=2, priority=100, in_port=${ovs_port}, arp, nw_src=${ipaddr}, arp_sha=${macaddr}, actions=load:${tenant_id}->NXM_NX_REG0[], goto_table:5" // "table=2, priority=100, in_port=${ovs_port}, ip, nw_src=${ipaddr}, actions=load:${tenant_id}->NXM_NX_REG0[], goto_table:3" // (${tenant_id} is always 0 for single-tenant) otx.AddFlow("table=2, priority=0, actions=drop") // Table 3: from OpenShift container; service vs non-service otx.AddFlow("table=3, priority=100, ip, nw_dst=%s, actions=goto_table:4", servicesNetworkCIDR) otx.AddFlow("table=3, priority=0, actions=goto_table:5") // Table 4: from OpenShift container; service dispatch; filled in by AddServiceRules() otx.AddFlow("table=4, priority=200, reg0=0, actions=output:2") // eg, "table=4, priority=100, reg0=${tenant_id}, ${service_proto}, nw_dst=${service_ip}, tp_dst=${service_port}, actions=output:2" otx.AddFlow("table=4, priority=0, actions=drop") // Table 5: general routing otx.AddFlow("table=5, priority=300, arp, nw_dst=%s, actions=output:2", localSubnetGateway) otx.AddFlow("table=5, priority=300, ip, nw_dst=%s, actions=output:2", localSubnetGateway) otx.AddFlow("table=5, priority=200, arp, nw_dst=%s, actions=goto_table:6", localSubnetCIDR) otx.AddFlow("table=5, priority=200, ip, nw_dst=%s, actions=goto_table:7", localSubnetCIDR) otx.AddFlow("table=5, priority=100, arp, nw_dst=%s, actions=goto_table:8", clusterNetworkCIDR) otx.AddFlow("table=5, priority=100, ip, nw_dst=%s, actions=goto_table:8", clusterNetworkCIDR) otx.AddFlow("table=5, priority=0, ip, actions=goto_table:9") otx.AddFlow("table=5, priority=0, arp, actions=drop") // Table 6: ARP to container, filled in by openshift-sdn-ovs // eg, "table=6, priority=100, arp, nw_dst=${container_ip}, actions=output:${ovs_port}" otx.AddFlow("table=6, priority=0, actions=output:3") // Table 7: IP to container; filled in by openshift-sdn-ovs // eg, "table=7, priority=100, reg0=0, ip, nw_dst=${ipaddr}, actions=output:${ovs_port}" // eg, "table=7, priority=100, reg0=${tenant_id}, ip, nw_dst=${ipaddr}, actions=output:${ovs_port}" otx.AddFlow("table=7, priority=0, actions=output:3") // Table 8: to remote container; filled in by AddHostSubnetRules() // eg, "table=8, priority=100, arp, nw_dst=${remote_subnet_cidr}, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31], set_field:${remote_node_ip}->tun_dst,output:1" // eg, "table=8, priority=100, ip, nw_dst=${remote_subnet_cidr}, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31], set_field:${remote_node_ip}->tun_dst,output:1" otx.AddFlow("table=8, priority=0, actions=drop") // Table 9: egress network policy dispatch; edited by updateEgressNetworkPolicy() // eg, "table=9, reg0=${tenant_id}, priority=2, ip, nw_dst=${external_cidr}, actions=drop otx.AddFlow("table=9, priority=0, actions=output:2") err = otx.EndTransaction() if err != nil { return false, err } itx = ipcmd.NewTransaction(exec, TUN) itx.AddAddress(gwCIDR) defer deleteLocalSubnetRoute(TUN, localSubnetCIDR) itx.SetLink("mtu", mtuStr) itx.SetLink("up") itx.AddRoute(clusterNetworkCIDR, "proto", "kernel", "scope", "link") itx.AddRoute(servicesNetworkCIDR) err = itx.EndTransaction() if err != nil { return false, err } // Clean up docker0 since docker won't itx = ipcmd.NewTransaction(exec, "docker0") itx.SetLink("down") itx.IgnoreError() itx.DeleteLink() itx.IgnoreError() _ = itx.EndTransaction() // Disable iptables for linux bridges (and in particular lbr0), ignoring errors. // (This has to have been performed in advance for docker-in-docker deployments, // since this will fail there). _, _ = exec.Command("modprobe", "br_netfilter").CombinedOutput() err = sysctl.SetSysctl("net/bridge/bridge-nf-call-iptables", 0) if err != nil { glog.Warningf("Could not set net.bridge.bridge-nf-call-iptables sysctl: %s", err) } else { glog.V(5).Infof("[SDN setup] set net.bridge.bridge-nf-call-iptables to 0") } // Enable IP forwarding for ipv4 packets err = sysctl.SetSysctl("net/ipv4/ip_forward", 1) if err != nil { return false, fmt.Errorf("Could not enable IPv4 forwarding: %s", err) } err = sysctl.SetSysctl(fmt.Sprintf("net/ipv4/conf/%s/forwarding", TUN), 1) if err != nil { return false, fmt.Errorf("Could not enable IPv4 forwarding on %s: %s", TUN, err) } // Table 253: rule version; note action is hex bytes separated by '.' otx = ovs.NewTransaction(exec, BR) pluginVersion := getPluginVersion(plugin.multitenant) otx.AddFlow("%s, %s%s.%s", VERSION_TABLE, VERSION_ACTION, pluginVersion[0], pluginVersion[1]) err = otx.EndTransaction() if err != nil { return false, err } return true, nil }