|
| 1 | +package network |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "net" |
| 6 | + |
| 7 | + "github.com/Azure/azure-container-networking/log" |
| 8 | + "github.com/Azure/azure-container-networking/netlink" |
| 9 | + "github.com/Azure/azure-container-networking/network/epcommon" |
| 10 | + "github.com/Azure/azure-container-networking/platform" |
| 11 | +) |
| 12 | + |
| 13 | +const ( |
| 14 | + FAKE_GW_IP = "169.254.1.1/32" |
| 15 | + DEFAULT_GW = "0.0.0.0/0" |
| 16 | +) |
| 17 | + |
| 18 | +type TransparentEndpointClient struct { |
| 19 | + bridgeName string |
| 20 | + hostPrimaryIfName string |
| 21 | + hostVethName string |
| 22 | + containerVethName string |
| 23 | + hostPrimaryMac net.HardwareAddr |
| 24 | + containerMac net.HardwareAddr |
| 25 | + hostVethMac net.HardwareAddr |
| 26 | + mode string |
| 27 | +} |
| 28 | + |
| 29 | +func NewTransparentEndpointClient( |
| 30 | + extIf *externalInterface, |
| 31 | + hostVethName string, |
| 32 | + containerVethName string, |
| 33 | + mode string, |
| 34 | +) *TransparentEndpointClient { |
| 35 | + |
| 36 | + client := &TransparentEndpointClient{ |
| 37 | + bridgeName: extIf.BridgeName, |
| 38 | + hostPrimaryIfName: extIf.Name, |
| 39 | + hostVethName: hostVethName, |
| 40 | + containerVethName: containerVethName, |
| 41 | + hostPrimaryMac: extIf.MacAddress, |
| 42 | + mode: mode, |
| 43 | + } |
| 44 | + |
| 45 | + return client |
| 46 | +} |
| 47 | + |
| 48 | +func setArpProxy(ifName string) error { |
| 49 | + cmd := fmt.Sprintf("echo 1 > /proc/sys/net/ipv4/conf/%v/proxy_arp", ifName) |
| 50 | + _, err := platform.ExecuteCommand(cmd) |
| 51 | + return err |
| 52 | +} |
| 53 | + |
| 54 | +func (client *TransparentEndpointClient) AddEndpoints(epInfo *EndpointInfo) error { |
| 55 | + if err := epcommon.CreateEndpoint(client.hostVethName, client.containerVethName); err != nil { |
| 56 | + return err |
| 57 | + } |
| 58 | + |
| 59 | + containerIf, err := net.InterfaceByName(client.containerVethName) |
| 60 | + if err != nil { |
| 61 | + return err |
| 62 | + } |
| 63 | + |
| 64 | + client.containerMac = containerIf.HardwareAddr |
| 65 | + |
| 66 | + hostVethIf, err := net.InterfaceByName(client.hostVethName) |
| 67 | + if err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + |
| 71 | + client.hostVethMac = hostVethIf.HardwareAddr |
| 72 | + |
| 73 | + return nil |
| 74 | +} |
| 75 | + |
| 76 | +func (client *TransparentEndpointClient) AddEndpointRules(epInfo *EndpointInfo) error { |
| 77 | + var routeInfoList []RouteInfo |
| 78 | + |
| 79 | + // ip route add <podip> dev <hostveth> |
| 80 | + // This route is needed for incoming packets to pod to route via hostveth |
| 81 | + for _, ipAddr := range epInfo.IPAddresses { |
| 82 | + var routeInfo RouteInfo |
| 83 | + ipNet := net.IPNet{IP: ipAddr.IP, Mask: net.CIDRMask(32, 32)} |
| 84 | + log.Printf("[net] Adding route for the ip %v", ipNet.String()) |
| 85 | + routeInfo.Dst = ipNet |
| 86 | + routeInfoList = append(routeInfoList, routeInfo) |
| 87 | + if err := addRoutes(client.hostVethName, routeInfoList); err != nil { |
| 88 | + return err |
| 89 | + } |
| 90 | + } |
| 91 | + |
| 92 | + log.Printf("calling setArpProxy for %v", client.hostVethName) |
| 93 | + if err := setArpProxy(client.hostVethName); err != nil { |
| 94 | + log.Printf("setArpProxy failed with: %v", err) |
| 95 | + return err |
| 96 | + } |
| 97 | + |
| 98 | + return nil |
| 99 | +} |
| 100 | + |
| 101 | +func (client *TransparentEndpointClient) DeleteEndpointRules(ep *endpoint) { |
| 102 | + var routeInfoList []RouteInfo |
| 103 | + |
| 104 | + // ip route del <podip> dev <hostveth> |
| 105 | + // Deleting the route set up for routing the incoming packets to pod |
| 106 | + for _, ipAddr := range ep.IPAddresses { |
| 107 | + var routeInfo RouteInfo |
| 108 | + ipNet := net.IPNet{IP: ipAddr.IP, Mask: net.CIDRMask(32, 32)} |
| 109 | + log.Printf("[net] Deleting route for the ip %v", ipNet.String()) |
| 110 | + routeInfo.Dst = ipNet |
| 111 | + routeInfoList = append(routeInfoList, routeInfo) |
| 112 | + deleteRoutes(client.hostVethName, routeInfoList) |
| 113 | + } |
| 114 | +} |
| 115 | + |
| 116 | +func (client *TransparentEndpointClient) MoveEndpointsToContainerNS(epInfo *EndpointInfo, nsID uintptr) error { |
| 117 | + // Move the container interface to container's network namespace. |
| 118 | + log.Printf("[net] Setting link %v netns %v.", client.containerVethName, epInfo.NetNsPath) |
| 119 | + if err := netlink.SetLinkNetNs(client.containerVethName, nsID); err != nil { |
| 120 | + return err |
| 121 | + } |
| 122 | + |
| 123 | + return nil |
| 124 | +} |
| 125 | + |
| 126 | +func (client *TransparentEndpointClient) SetupContainerInterfaces(epInfo *EndpointInfo) error { |
| 127 | + if err := epcommon.SetupContainerInterface(client.containerVethName, epInfo.IfName); err != nil { |
| 128 | + return err |
| 129 | + } |
| 130 | + |
| 131 | + client.containerVethName = epInfo.IfName |
| 132 | + |
| 133 | + return nil |
| 134 | +} |
| 135 | + |
| 136 | +func (client *TransparentEndpointClient) ConfigureContainerInterfacesAndRoutes(epInfo *EndpointInfo) error { |
| 137 | + if err := epcommon.AssignIPToInterface(client.containerVethName, epInfo.IPAddresses); err != nil { |
| 138 | + return err |
| 139 | + } |
| 140 | + |
| 141 | + return addRoutes(client.containerVethName, epInfo.Routes) |
| 142 | +} |
| 143 | + |
| 144 | +func (client *TransparentEndpointClient) DeleteEndpoints(ep *endpoint) error { |
| 145 | + log.Printf("[net] Deleting veth pair %v %v.", ep.HostIfName, ep.IfName) |
| 146 | + err := netlink.DeleteLink(ep.HostIfName) |
| 147 | + if err != nil { |
| 148 | + log.Printf("[net] Failed to delete veth pair %v: %v.", ep.HostIfName, err) |
| 149 | + return err |
| 150 | + } |
| 151 | + |
| 152 | + return nil |
| 153 | +} |
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