func CreateDatapath(dpname string) (err error, supported bool) {
dpif, err := odp.NewDpif()
if err != nil {
if odp.IsKernelLacksODPError(err) {
return nil, false
}
return err, true
}
defer dpif.Close()
dp, err := dpif.CreateDatapath(dpname)
if err != nil && !odp.IsDatapathNameAlreadyExistsError(err) {
return err, true
}
// Pick an ephemeral port number to use in probing for vxlan
// support.
udpconn, err := net.ListenUDP("udp4", nil)
if err != nil {
return err, true
}
// we leave the UDP socket open, so creating a vxlan vport on
// the same port number should fail. But that's fine: It's
// still sufficient to probe for support.
portno := uint16(udpconn.LocalAddr().(*net.UDPAddr).Port)
vpid, err := dp.CreateVport(odp.NewVxlanVportSpec(
fmt.Sprintf("vxlan-%d", portno), portno))
if nlerr, ok := err.(odp.NetlinkError); ok {
if syscall.Errno(nlerr) == syscall.EAFNOSUPPORT {
dp.Delete()
return fmt.Errorf("kernel does not have Open vSwitch VXLAN support"), false
}
}
if err == nil {
dp.DeleteVport(vpid)
}
udpconn.Close()
return nil, true
}
func main() {
procs := runtime.NumCPU()
// packet sniffing can block an OS thread, so we need one thread
// for that plus at least one more.
if procs < 2 {
procs = 2
}
runtime.GOMAXPROCS(procs)
var (
// flags that cause immediate exit
justVersion bool
createDatapath bool
deleteDatapath bool
addDatapathInterface string
config weave.Config
protocolMinVersion int
ifaceName string
routerName string
nickName string
password string
pktdebug bool
logLevel string
prof string
bufSzMB int
noDiscovery bool
httpAddr string
iprangeCIDR string
ipsubnetCIDR string
peerCount int
dockerAPI string
peers []string
noDNS bool
dnsDomain string
dnsListenAddress string
dnsTTL int
dnsClientTimeout time.Duration
dnsEffectiveListenAddress string
iface *net.Interface
datapathName string
)
mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
mflag.BoolVar(&createDatapath, []string{"-create-datapath"}, false, "create ODP datapath and exit")
mflag.BoolVar(&deleteDatapath, []string{"-delete-datapath"}, false, "delete ODP datapath and exit")
mflag.StringVar(&addDatapathInterface, []string{"-add-datapath-iface"}, "", "add a network interface to the ODP datapath and exit")
mflag.IntVar(&config.Port, []string{"#port", "-port"}, weave.Port, "router port")
mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, weave.ProtocolMinVersion, "minimum weave protocol version")
mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
mflag.StringVar(&password, []string{"#password", "-password"}, "", "network password")
mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
mflag.BoolVar(&pktdebug, []string{"#pktdebug", "#-pktdebug", "-pkt-debug"}, false, "enable per-packet debug logging")
mflag.StringVar(&prof, []string{"#profile", "-profile"}, "", "enable profiling and write profiles to given path")
mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
mflag.StringVar(&dockerAPI, []string{"#api", "#-api", "-docker-api"}, "", "Docker API endpoint, e.g. unix:///var/run/docker.sock")
mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
mflag.StringVar(&dnsListenAddress, []string{"-dns-listen-address"}, nameserver.DefaultListenAddress, "address to listen on for DNS requests")
mflag.IntVar(&dnsTTL, []string{"-dns-ttl"}, nameserver.DefaultTTL, "TTL for DNS request from our domain")
mflag.DurationVar(&dnsClientTimeout, []string{"-dns-fallback-timeout"}, nameserver.DefaultClientTimeout, "timeout for fallback DNS requests")
mflag.StringVar(&dnsEffectiveListenAddress, []string{"-dns-effective-listen-address"}, "", "address DNS will actually be listening, after Docker port mapping")
mflag.StringVar(&datapathName, []string{"-datapath"}, "", "ODP datapath name")
// crude way of detecting that we probably have been started in a
// container, with `weave launch` --> suppress misleading paths in
// mflags error messages.
if os.Args[0] == "/home/weave/weaver" { // matches the Dockerfile ENTRYPOINT
os.Args[0] = "weave"
mflag.CommandLine.Init("weave", mflag.ExitOnError)
}
mflag.Parse()
peers = mflag.Args()
SetLogLevel(logLevel)
switch {
case justVersion:
fmt.Printf("weave router %s\n", version)
os.Exit(0)
case createDatapath:
err := weave.CreateDatapath(datapathName)
if odp.IsKernelLacksODPError(err) {
// When the kernel lacks ODP support, exit
// with a special status to distinguish it for
// the weave script.
os.Exit(17)
}
checkFatal(err)
os.Exit(0)
case deleteDatapath:
checkFatal(weave.DeleteDatapath(datapathName))
os.Exit(0)
case addDatapathInterface != "":
checkFatal(weave.AddDatapathInterface(datapathName, addDatapathInterface))
os.Exit(0)
}
Log.Println("Command line options:", options())
Log.Println("Command line peers:", peers)
if protocolMinVersion < weave.ProtocolMinVersion || protocolMinVersion > weave.ProtocolMaxVersion {
Log.Fatalf("--min-protocol-version must be in range [%d,%d]", weave.ProtocolMinVersion, weave.ProtocolMaxVersion)
}
config.ProtocolMinVersion = byte(protocolMinVersion)
var fastDPOverlay weave.Overlay
if datapathName != "" {
// A datapath name implies that "Bridge" and "Overlay"
// packet handling use fast datapath, although other
// options can override that below. Even if both
// things are overridden, we might need bridging on
// the datapath.
fastdp, err := weave.NewFastDatapath(weave.FastDatapathConfig{
DatapathName: datapathName,
Port: config.Port,
})
checkFatal(err)
config.Bridge = fastdp.Bridge()
fastDPOverlay = fastdp.Overlay()
}
if ifaceName != "" {
// -iface can coexist with -datapath, because
// pcap-based packet capture is a bit more efficient
// than capture via ODP misses, even when using an
// ODP-based bridge. So when using weave encyption,
// it's preferable to use -iface.
var err error
iface, err = weavenet.EnsureInterface(ifaceName)
checkFatal(err)
// bufsz flag is in MB
config.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
checkFatal(err)
}
if password == "" {
password = os.Getenv("WEAVE_PASSWORD")
}
if password == "" {
Log.Println("Communication between peers is unencrypted.")
} else {
config.Password = []byte(password)
Log.Println("Communication between peers is encrypted.")
// fastdp doesn't support encryption
fastDPOverlay = nil
}
overlays := weave.NewOverlaySwitch()
if fastDPOverlay != nil {
overlays.Add("fastdp", fastDPOverlay)
}
sleeve := weave.NewSleeveOverlay(config.Port)
overlays.Add("sleeve", sleeve)
overlays.SetCompatOverlay(sleeve)
config.Overlay = overlays
if routerName == "" {
if iface == nil {
Log.Fatal("Either an interface must be specified with --iface or a name with -name")
}
routerName = iface.HardwareAddr.String()
}
name, err := weave.PeerNameFromUserInput(routerName)
checkFatal(err)
if nickName == "" {
nickName, err = os.Hostname()
checkFatal(err)
}
if prof != "" {
p := *profile.CPUProfile
p.ProfilePath = prof
p.NoShutdownHook = true
defer profile.Start(&p).Stop()
}
config.PeerDiscovery = !noDiscovery
if pktdebug {
config.PacketLogging = packetLogging{}
} else {
config.PacketLogging = nopPacketLogging{}
}
router := weave.NewRouter(config, name, nickName)
Log.Println("Our name is", router.Ourself)
var dockerCli *docker.Client
if dockerAPI != "" {
dc, err := docker.NewClient(dockerAPI)
if err != nil {
Log.Fatal("Unable to start docker client: ", err)
}
dockerCli = dc
}
observeContainers := func(o docker.ContainerObserver) {
if dockerCli != nil {
if err = dockerCli.AddObserver(o); err != nil {
Log.Fatal("Unable to start watcher", err)
}
}
}
var allocator *ipam.Allocator
var defaultSubnet address.CIDR
if iprangeCIDR != "" {
allocator, defaultSubnet = createAllocator(router, iprangeCIDR, ipsubnetCIDR, determineQuorum(peerCount, peers))
observeContainers(allocator)
} else if peerCount > 0 {
Log.Fatal("--init-peer-count flag specified without --ipalloc-range")
}
var (
ns *nameserver.Nameserver
dnsserver *nameserver.DNSServer
)
if !noDNS {
ns = nameserver.New(router.Ourself.Peer.Name, router.Peers, dnsDomain)
ns.SetGossip(router.NewGossip("nameserver", ns))
observeContainers(ns)
ns.Start()
defer ns.Stop()
dnsserver, err = nameserver.NewDNSServer(ns, dnsDomain, dnsListenAddress,
dnsEffectiveListenAddress, uint32(dnsTTL), dnsClientTimeout)
if err != nil {
Log.Fatal("Unable to start dns server: ", err)
}
listenAddr := dnsListenAddress
if dnsEffectiveListenAddress != "" {
listenAddr = dnsEffectiveListenAddress
}
Log.Println("Listening for DNS queries on", listenAddr)
dnsserver.ActivateAndServe()
defer dnsserver.Stop()
}
router.Start()
if errors := router.ConnectionMaker.InitiateConnections(peers, false); len(errors) > 0 {
Log.Fatal(ErrorMessages(errors))
}
// The weave script always waits for a status call to succeed,
// so there is no point in doing "weave launch --http-addr ''".
// This is here to support stand-alone use of weaver.
if httpAddr != "" {
muxRouter := mux.NewRouter()
if allocator != nil {
allocator.HandleHTTP(muxRouter, defaultSubnet, dockerCli)
}
if ns != nil {
ns.HandleHTTP(muxRouter, dockerCli)
}
router.HandleHTTP(muxRouter)
HandleHTTP(muxRouter, version, router, allocator, defaultSubnet, ns, dnsserver)
http.Handle("/", muxRouter)
Log.Println("Listening for HTTP control messages on", httpAddr)
go listenAndServeHTTP(httpAddr, muxRouter)
}
SignalHandlerLoop(router)
}