| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| package netstack |
| |
| import ( |
| "context" |
| "fmt" |
| "log" |
| "sort" |
| "strings" |
| "sync" |
| |
| "netstack/dns" |
| "netstack/fidlconv" |
| "netstack/filter" |
| "netstack/link" |
| "netstack/link/bridge" |
| "netstack/link/eth" |
| "netstack/link/stats" |
| "netstack/netiface" |
| "netstack/util" |
| |
| "fidl/fuchsia/devicesettings" |
| "fidl/fuchsia/hardware/ethernet" |
| "fidl/fuchsia/net" |
| "fidl/fuchsia/netstack" |
| |
| "github.com/google/netstack/dhcp" |
| "github.com/google/netstack/tcpip" |
| "github.com/google/netstack/tcpip/header" |
| "github.com/google/netstack/tcpip/link/loopback" |
| "github.com/google/netstack/tcpip/link/sniffer" |
| "github.com/google/netstack/tcpip/network/arp" |
| "github.com/google/netstack/tcpip/network/ipv4" |
| "github.com/google/netstack/tcpip/network/ipv6" |
| "github.com/google/netstack/tcpip/stack" |
| ) |
| |
| const ( |
| deviceSettingsManagerNodenameKey = "DeviceName" |
| defaultNodename = "fuchsia-unset-device-name" |
| |
| ipv4Loopback tcpip.Address = "\x7f\x00\x00\x01" |
| ipv6Loopback tcpip.Address = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01" |
| ) |
| |
| // A Netstack tracks all of the running state of the network stack. |
| type Netstack struct { |
| arena *eth.Arena |
| |
| deviceSettings *devicesettings.DeviceSettingsManagerInterface |
| dnsClient *dns.Client |
| |
| mu struct { |
| sync.Mutex |
| stack *stack.Stack |
| transactionRequest *netstack.RouteTableTransactionInterfaceRequest |
| countNIC tcpip.NICID |
| ifStates map[tcpip.NICID]*ifState |
| } |
| nodename string |
| |
| filter *filter.Filter |
| |
| OnInterfacesChanged func([]netstack.NetInterface) |
| } |
| |
| type dhcpState struct { |
| client *dhcp.Client |
| cancel context.CancelFunc |
| enabled bool |
| } |
| |
| // Each ifState tracks the state of a network interface. |
| type ifState struct { |
| ns *Netstack |
| eth link.Controller |
| mu struct { |
| sync.Mutex |
| state link.State |
| // TODO(NET-1223): remove and replace with refs to stack via ns |
| nic *netiface.NIC |
| dhcpState |
| } |
| ctx context.Context |
| cancel context.CancelFunc |
| |
| // The "outermost" LinkEndpoint implementation (the composition of link |
| // endpoint functionality happens by wrapping other link endpoints). |
| endpoint stack.LinkEndpoint |
| |
| // statsEP and bridgeable are wrapper LinkEndpoint implementations that need |
| // to be accessed by their concrete type. |
| statsEP *stats.StatsEndpoint |
| bridgeable *bridge.BridgeableEndpoint |
| } |
| |
| func defaultRouteTable(nicid tcpip.NICID, gateway tcpip.Address) []tcpip.Route { |
| return []tcpip.Route{ |
| { |
| Destination: tcpip.Address(strings.Repeat("\x00", 4)), |
| Mask: tcpip.AddressMask(strings.Repeat("\x00", 4)), |
| Gateway: gateway, |
| NIC: nicid, |
| }, |
| { |
| Destination: tcpip.Address(strings.Repeat("\x00", 16)), |
| Mask: tcpip.AddressMask(strings.Repeat("\x00", 16)), |
| NIC: nicid, |
| }, |
| } |
| } |
| |
| func subnetRoute(addr tcpip.Address, mask tcpip.AddressMask, nicid tcpip.NICID) tcpip.Route { |
| return tcpip.Route{ |
| Destination: util.ApplyMask(addr, mask), |
| Mask: tcpip.AddressMask(mask), |
| Gateway: tcpip.Address(""), |
| NIC: nicid, |
| } |
| } |
| |
| func (ns *Netstack) removeInterfaceAddress(nic tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address, prefixLen uint8) error { |
| subnet, err := toSubnet(addr, prefixLen) |
| if err != nil { |
| return fmt.Errorf("error parsing subnet format for NIC ID %d: %s", nic, err) |
| } |
| |
| ns.mu.Lock() |
| if err := func() error { |
| if hasSubnet, err := ns.mu.stack.ContainsSubnet(nic, subnet); err != nil { |
| return fmt.Errorf("error finding subnet %+v for NIC ID %d: %s", subnet, nic, err) |
| } else if hasSubnet { |
| if err := ns.mu.stack.RemoveSubnet(nic, subnet); err != nil { |
| return fmt.Errorf("error removing subnet %+v from NIC ID %d: %s", subnet, nic, err) |
| } |
| } else { |
| return fmt.Errorf("no such subnet %+v for NIC ID %d", subnet, nic) |
| } |
| |
| if err := ns.mu.stack.RemoveAddress(nic, addr); err != nil { |
| return fmt.Errorf("error removing address %s from NIC ID %d: %s", addr, nic, err) |
| } |
| |
| if addr, subnet, err := ns.mu.stack.GetMainNICAddress(nic, protocol); err != nil { |
| return fmt.Errorf("error querying NIC ID %d, error: %s", nic, err) |
| } else { |
| netmask := subnet.Mask() |
| if netmask == "" { |
| addressSize := len(addr) * 8 |
| netmask = util.CIDRMask(addressSize, addressSize) |
| } |
| |
| if ifs, ok := ns.mu.ifStates[nic]; !ok { |
| panic(fmt.Sprintf("Interface state table out of sync: NIC [%d] known to third_party/netstack not found in garnet/netstack", nic)) |
| } else { |
| ifs.staticAddressChanged(addr, netmask) |
| ifs.ns.mu.stack.SetRouteTable(ifs.ns.flattenRouteTablesLocked()) |
| } |
| } |
| return nil |
| }(); err != nil { |
| ns.mu.Unlock() |
| return err |
| } |
| |
| interfaces := ns.getNetInterfacesLocked() |
| ns.mu.Unlock() |
| ns.OnInterfacesChanged(interfaces) |
| return nil |
| } |
| |
| func toSubnet(address tcpip.Address, prefixLen uint8) (tcpip.Subnet, error) { |
| m := util.CIDRMask(int(prefixLen), int(len(address)*8)) |
| return tcpip.NewSubnet(util.ApplyMask(address, m), m) |
| } |
| |
| func (ns *Netstack) setInterfaceAddress(nic tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address, prefixLen uint8) error { |
| subnet, err := toSubnet(addr, prefixLen) |
| if err != nil { |
| return fmt.Errorf("error parsing subnet format for NIC ID %d: %s", nic, err) |
| } |
| |
| ns.mu.Lock() |
| if err := func() error { |
| if err := ns.mu.stack.AddAddress(nic, protocol, addr); err != nil { |
| return fmt.Errorf("error adding address %s to NIC ID %d: %s", addr, nic, err) |
| } |
| |
| if err := ns.mu.stack.AddSubnet(nic, protocol, subnet); err != nil { |
| return fmt.Errorf("error adding subnet %+v to NIC ID %d: %s", subnet, nic, err) |
| } |
| |
| if ifs, ok := ns.mu.ifStates[nic]; !ok { |
| panic(fmt.Sprintf("Interface state table out of sync: NIC [%d] known to third_party/netstack not found in garnet/netstack", nic)) |
| } else { |
| ifs.staticAddressChanged(addr, subnet.Mask()) |
| ifs.ns.mu.stack.SetRouteTable(ifs.ns.flattenRouteTablesLocked()) |
| } |
| return nil |
| }(); err != nil { |
| ns.mu.Unlock() |
| return err |
| } |
| |
| interfaces := ns.getNetInterfacesLocked() |
| ns.mu.Unlock() |
| ns.OnInterfacesChanged(interfaces) |
| return nil |
| } |
| |
| func (ifs *ifState) staticAddressChanged(newAddr tcpip.Address, netmask tcpip.AddressMask) { |
| ifs.mu.Lock() |
| ifs.mu.nic.Addr = newAddr |
| ifs.mu.nic.Netmask = netmask |
| ifs.mu.nic.Routes = append(ifs.mu.nic.Routes, subnetRoute(newAddr, netmask, ifs.mu.nic.ID)) |
| ifs.mu.Unlock() |
| } |
| |
| func (ifs *ifState) dhcpAcquired(oldAddr, newAddr tcpip.Address, config dhcp.Config) { |
| if oldAddr != "" && oldAddr != newAddr { |
| log.Printf("NIC %s: DHCP IP %s expired", ifs.mu.nic.Name, oldAddr) |
| } |
| if config.Error != nil { |
| log.Printf("%v", config.Error) |
| return |
| } |
| if newAddr == "" { |
| log.Printf("NIC %s: DHCP could not acquire address", ifs.mu.nic.Name) |
| return |
| } |
| log.Printf("NIC %s: DHCP acquired IP %s for %s", ifs.mu.nic.Name, newAddr, config.LeaseLength) |
| log.Printf("NIC %s: Adding DNS servers: %v", ifs.mu.nic.Name, config.DNS) |
| |
| // Update default route with new gateway. |
| ifs.mu.Lock() |
| ifs.mu.nic.Routes = defaultRouteTable(ifs.mu.nic.ID, config.Gateway) |
| ifs.mu.nic.Routes = append(ifs.mu.nic.Routes, subnetRoute(newAddr, config.SubnetMask, ifs.mu.nic.ID)) |
| ifs.mu.nic.Netmask = config.SubnetMask |
| ifs.mu.nic.Addr = newAddr |
| ifs.mu.nic.DNSServers = config.DNS |
| ifs.mu.Unlock() |
| |
| ifs.ns.mu.Lock() |
| ifs.ns.mu.stack.SetRouteTable(ifs.ns.flattenRouteTablesLocked()) |
| interfaces := ifs.ns.getNetInterfacesLocked() |
| ifs.ns.mu.Unlock() |
| |
| ifs.ns.dnsClient.SetRuntimeServers(ifs.ns.getRuntimeDNSServerRefs()) |
| ifs.ns.OnInterfacesChanged(interfaces) |
| } |
| |
| func (ifs *ifState) setDHCPStatusLocked(enabled bool) { |
| d := &ifs.mu.dhcpState |
| if enabled == d.enabled { |
| return |
| } |
| if enabled { |
| ctx, cancel := context.WithCancel(ifs.ctx) |
| d.cancel = cancel |
| if c := d.client; c != nil { |
| c.Run(ctx) |
| } else { |
| panic(fmt.Sprintf("nil DHCP client on interface %s", ifs.mu.nic.Name)) |
| } |
| } else if d.cancel != nil { |
| d.cancel() |
| } |
| d.enabled = enabled |
| } |
| |
| func (ifs *ifState) stateChange(s link.State) { |
| ifs.ns.mu.Lock() |
| ifs.mu.Lock() |
| switch s { |
| case link.StateClosed: |
| delete(ifs.ns.mu.ifStates, ifs.mu.nic.ID) |
| fallthrough |
| case link.StateDown: |
| log.Printf("NIC %s: stopped", ifs.mu.nic.Name) |
| if ifs.cancel != nil { |
| ifs.cancel() |
| } |
| if ifs.mu.dhcpState.cancel != nil { |
| // TODO: consider remembering DHCP status |
| ifs.setDHCPStatusLocked(false) |
| } |
| |
| // TODO(crawshaw): more cleanup to be done here: |
| // - remove link endpoint |
| // - reclaim NICID? |
| |
| ifs.mu.nic.Routes = nil |
| ifs.mu.nic.Netmask = "\xff\xff\xff\xff" |
| ifs.mu.nic.Addr = "\x00\x00\x00\x00" |
| ifs.mu.nic.DNSServers = nil |
| |
| case link.StateStarted: |
| // Only call `restarted` if we are not in the initial state (which means we're still starting). |
| if ifs.mu.state != link.StateUnknown { |
| log.Printf("NIC %s: restarting", ifs.mu.nic.Name) |
| ifs.ctx, ifs.cancel = context.WithCancel(context.Background()) |
| ifs.mu.nic.Routes = defaultRouteTable(ifs.mu.nic.ID, "") |
| ifs.setDHCPStatusLocked(true) |
| |
| } |
| } |
| ifs.mu.state = s |
| ifs.mu.Unlock() |
| |
| ifs.ns.mu.stack.SetRouteTable(ifs.ns.flattenRouteTablesLocked()) |
| |
| interfaces := ifs.ns.getNetInterfacesLocked() |
| ifs.ns.mu.Unlock() |
| |
| ifs.ns.dnsClient.SetRuntimeServers(ifs.ns.getRuntimeDNSServerRefs()) |
| ifs.ns.OnInterfacesChanged(interfaces) |
| } |
| |
| func (ns *Netstack) flattenRouteTablesLocked() []tcpip.Route { |
| routes := make([]tcpip.Route, 0) |
| nics := make(map[tcpip.NICID]*netiface.NIC) |
| for _, ifs := range ns.mu.ifStates { |
| ifs.mu.Lock() |
| routes = append(routes, ifs.mu.nic.Routes...) |
| nics[ifs.mu.nic.ID] = ifs.mu.nic |
| ifs.mu.Unlock() |
| } |
| sort.Slice(routes, func(i, j int) bool { |
| return netiface.Less(&routes[i], &routes[j], nics) |
| }) |
| if debug { |
| for i, ifs := range ns.mu.ifStates { |
| log.Printf("[%v] nicid: %v, addr: %v, routes: %v", |
| i, ifs.mu.nic.ID, ifs.mu.nic.Addr, ifs.mu.nic.Routes) |
| } |
| } |
| |
| return routes |
| } |
| |
| // Return a slice of references to each NIC's DNS servers. |
| // The caller takes ownership of the returned slice. |
| func (ns *Netstack) getRuntimeDNSServerRefs() []*[]tcpip.Address { |
| ns.mu.Lock() |
| defer ns.mu.Unlock() |
| |
| refs := make([]*[]tcpip.Address, 0, len(ns.mu.ifStates)) |
| for _, ifs := range ns.mu.ifStates { |
| ifs.mu.Lock() |
| refs = append(refs, &ifs.mu.nic.DNSServers) |
| ifs.mu.Unlock() |
| } |
| return refs |
| } |
| |
| func (ns *Netstack) getDNSServers() []tcpip.Address { |
| defaultServers := ns.dnsClient.GetDefaultServers() |
| uniqServers := make(map[tcpip.Address]struct{}) |
| |
| ns.mu.Lock() |
| for _, ifs := range ns.mu.ifStates { |
| ifs.mu.Lock() |
| for _, server := range ifs.mu.nic.DNSServers { |
| uniqServers[server] = struct{}{} |
| } |
| ifs.mu.Unlock() |
| } |
| ns.mu.Unlock() |
| |
| out := make([]tcpip.Address, 0, len(defaultServers)+len(uniqServers)) |
| out = append(out, defaultServers...) |
| for server := range uniqServers { |
| out = append(out, server) |
| } |
| return out |
| } |
| |
| func (ns *Netstack) getNodeName() string { |
| nodename, status, err := ns.deviceSettings.GetString(deviceSettingsManagerNodenameKey) |
| if err != nil { |
| log.Printf("getNodeName: error accessing device settings: %s", err) |
| return defaultNodename |
| } |
| if status != devicesettings.StatusOk { |
| var reportStatus string |
| switch status { |
| case devicesettings.StatusErrNotSet: |
| reportStatus = "key not set" |
| case devicesettings.StatusErrInvalidSetting: |
| reportStatus = "invalid setting" |
| case devicesettings.StatusErrRead: |
| reportStatus = "error reading key" |
| case devicesettings.StatusErrIncorrectType: |
| reportStatus = "value type was incorrect" |
| case devicesettings.StatusErrUnknown: |
| reportStatus = "unknown" |
| default: |
| reportStatus = fmt.Sprintf("unknown status code: %d", status) |
| } |
| if debug { |
| log.Printf("getNodeName: device settings error: %s", reportStatus) |
| } |
| return defaultNodename |
| } |
| return nodename |
| } |
| |
| // TODO(tamird): refactor to use addEndpoint. |
| func (ns *Netstack) addLoopback() error { |
| const nicid = 1 |
| ctx, cancel := context.WithCancel(context.Background()) |
| nic := &netiface.NIC{ |
| ID: nicid, |
| Addr: ipv4Loopback, |
| Netmask: tcpip.AddressMask(strings.Repeat("\xff", len(ipv4Loopback))), |
| Features: ethernet.InfoFeatureLoopback, |
| Routes: []tcpip.Route{ |
| { |
| Destination: ipv4Loopback, |
| Mask: tcpip.AddressMask(strings.Repeat("\xff", 4)), |
| NIC: nicid, |
| }, |
| { |
| Destination: ipv6Loopback, |
| Mask: tcpip.AddressMask(strings.Repeat("\xff", 16)), |
| NIC: nicid, |
| }, |
| }, |
| } |
| |
| nic.Name = "lo" |
| |
| ifs := &ifState{ |
| ns: ns, |
| ctx: ctx, |
| cancel: cancel, |
| } |
| |
| ifs.mu.state = link.StateStarted |
| ifs.mu.nic = nic |
| |
| ns.mu.Lock() |
| defer ns.mu.Unlock() |
| if len(ns.mu.ifStates) > 0 { |
| return fmt.Errorf("loopback: other interfaces already registered") |
| } |
| ns.mu.ifStates[nicid] = ifs |
| ns.mu.countNIC++ |
| |
| linkID := loopback.New() |
| if debug { |
| linkID = sniffer.New(linkID) |
| } |
| linkID, ifs.statsEP = stats.NewEndpoint(linkID) |
| ifs.statsEP.Nic = ifs.mu.nic |
| |
| if err := ns.mu.stack.CreateNIC(nicid, linkID); err != nil { |
| return fmt.Errorf("loopback: could not create interface: %v", err) |
| } |
| if err := ns.mu.stack.AddAddress(nicid, ipv4.ProtocolNumber, ipv4Loopback); err != nil { |
| return fmt.Errorf("loopback: adding ipv4 address failed: %v", err) |
| } |
| if err := ns.mu.stack.AddAddress(nicid, ipv6.ProtocolNumber, ipv6Loopback); err != nil { |
| return fmt.Errorf("loopback: adding ipv6 address failed: %v", err) |
| } |
| |
| ns.mu.stack.SetRouteTable(ns.flattenRouteTablesLocked()) |
| |
| return nil |
| } |
| |
| func (ns *Netstack) Bridge(nics []tcpip.NICID) (*ifState, error) { |
| links := make([]*bridge.BridgeableEndpoint, 0, len(nics)) |
| ns.mu.Lock() |
| for _, nicid := range nics { |
| ifs, ok := ns.mu.ifStates[nicid] |
| if !ok { |
| panic("NIC known by netstack not in interface table") |
| } |
| if err := ifs.eth.SetPromiscuousMode(true); err != nil { |
| return nil, err |
| } |
| links = append(links, ifs.bridgeable) |
| } |
| ns.mu.Unlock() |
| |
| return ns.addEndpoint(func(ifs *ifState) (stack.LinkEndpoint, error) { |
| b := bridge.New(links) |
| ifs.eth = b |
| return b, nil |
| }, func(ifs *ifState) error { |
| if len(ifs.mu.nic.Name) == 0 { |
| ifs.mu.nic.Name = fmt.Sprintf("br%d", ifs.mu.nic.ID) |
| } |
| return ifs.eth.Up() |
| }) |
| } |
| |
| func (ns *Netstack) addEth(topological_path string, config netstack.InterfaceConfig, device ethernet.Device) (*ifState, error) { |
| var client *eth.Client |
| return ns.addEndpoint(func(ifs *ifState) (stack.LinkEndpoint, error) { |
| var err error |
| client, err = eth.NewClient("netstack", topological_path, device, ns.arena) |
| if err != nil { |
| return nil, err |
| } |
| ifs.eth = client |
| ifs.mu.nic.Features = client.Info.Features |
| ifs.mu.nic.Name = config.Name |
| return eth.NewLinkEndpoint(client), nil |
| }, func(ifs *ifState) error { |
| if len(ifs.mu.nic.Name) == 0 { |
| ifs.mu.nic.Name = fmt.Sprintf("eth%d", ifs.mu.nic.ID) |
| } |
| |
| switch config.IpAddressConfig.Which() { |
| case netstack.IpAddressConfigDhcp: |
| ifs.mu.Lock() |
| ifs.setDHCPStatusLocked(true) |
| ifs.mu.Unlock() |
| case netstack.IpAddressConfigStaticIp: |
| subnet := config.IpAddressConfig.StaticIp |
| protocol, tcpipAddr, retval := ns.validateInterfaceAddress(subnet.Addr, subnet.PrefixLen) |
| if retval.Status != netstack.StatusOk { |
| return fmt.Errorf("NIC %s: received static IpAddressConfig with an invalid IP specified: [%+v]", ifs.mu.nic.Name, subnet) |
| } |
| ns.setInterfaceAddress(ifs.mu.nic.ID, protocol, tcpipAddr, subnet.PrefixLen) |
| } |
| return ifs.eth.Up() |
| }) |
| } |
| |
| func (ns *Netstack) addEndpoint(makeEndpoint func(*ifState) (stack.LinkEndpoint, error), finalize func(*ifState) error) (*ifState, error) { |
| ctx, cancel := context.WithCancel(context.Background()) |
| |
| ifs := &ifState{ |
| ns: ns, |
| ctx: ctx, |
| cancel: cancel, |
| } |
| ifs.mu.state = link.StateUnknown |
| ifs.mu.nic = &netiface.NIC{ |
| Addr: "\x00\x00\x00\x00", |
| Netmask: "\xff\xff\xff\xff", |
| } |
| |
| ep, err := makeEndpoint(ifs) |
| if err != nil { |
| return nil, err |
| } |
| if ifs.eth == nil { |
| return nil, fmt.Errorf("makeEndpoint func did not set ifs.eth") |
| } |
| ifs.eth.SetOnStateChange(ifs.stateChange) |
| linkID := stack.RegisterLinkEndpoint(ep) |
| linkAddr := ep.LinkAddress() |
| lladdr := header.LinkLocalAddr(linkAddr) |
| |
| // LinkEndpoint chains: |
| // Put sniffer as close as the NIC. |
| if debug { |
| // A wrapper LinkEndpoint should encapsulate the underlying |
| // one, and manifest itself to 3rd party netstack. |
| linkID = sniffer.New(linkID) |
| } |
| |
| linkID = filter.NewEndpoint(ns.filter, linkID) |
| linkID, ifs.statsEP = stats.NewEndpoint(linkID) |
| linkID, ifs.bridgeable = bridge.NewEndpoint(linkID) |
| ifs.endpoint = ifs.bridgeable |
| |
| ns.mu.Lock() |
| |
| nicid := ns.mu.countNIC + 1 |
| ns.mu.ifStates[nicid] = ifs |
| ns.mu.countNIC++ |
| |
| log.Printf("NIC %s added", ifs.mu.nic.Name) |
| |
| if err := ns.mu.stack.CreateNIC(nicid, linkID); err != nil { |
| return nil, fmt.Errorf("NIC %s: could not create NIC: %v", ifs.mu.nic.Name, err) |
| } |
| if err := ns.mu.stack.AddAddress(nicid, arp.ProtocolNumber, arp.ProtocolAddress); err != nil { |
| return nil, fmt.Errorf("NIC %s: adding arp address failed: %v", ifs.mu.nic.Name, err) |
| } |
| if err := ns.mu.stack.AddAddress(nicid, ipv6.ProtocolNumber, lladdr); err != nil { |
| return nil, fmt.Errorf("NIC %s: adding link-local IPv6 %v failed: %v", ifs.mu.nic.Name, lladdr, err) |
| } |
| snaddr := header.SolicitedNodeAddr(lladdr) |
| if err := ns.mu.stack.AddAddress(nicid, ipv6.ProtocolNumber, snaddr); err != nil { |
| return nil, fmt.Errorf("NIC %s: adding solicited-node IPv6 %v (link-local IPv6 %v) failed: %v", ifs.mu.nic.Name, snaddr, lladdr, err) |
| } |
| log.Printf("NIC %s: link-local IPv6: %v", ifs.mu.nic.Name, lladdr) |
| |
| ifs.mu.Lock() |
| ifs.mu.nic.ID = nicid |
| ifs.mu.nic.Routes = defaultRouteTable(nicid, "") |
| ifs.mu.nic.Ipv6addrs = []tcpip.Address{lladdr} |
| ifs.statsEP.Nic = ifs.mu.nic |
| ifs.mu.dhcpState.client = dhcp.NewClient(ns.mu.stack, nicid, linkAddr, ifs.dhcpAcquired) |
| ifs.mu.Unlock() |
| |
| // Add default route. This will get clobbered later when we get a DHCP response. |
| ns.mu.stack.SetRouteTable(ns.flattenRouteTablesLocked()) |
| ns.mu.Unlock() |
| |
| return ifs, finalize(ifs) |
| } |
| |
| func (ns *Netstack) validateInterfaceAddress(address net.IpAddress, prefixLen uint8) (tcpip.NetworkProtocolNumber, tcpip.Address, netstack.NetErr) { |
| var protocol tcpip.NetworkProtocolNumber |
| switch address.Which() { |
| case net.IpAddressIpv4: |
| protocol = ipv4.ProtocolNumber |
| case net.IpAddressIpv6: |
| return 0, "", netstack.NetErr{Status: netstack.StatusIpv4Only, Message: "IPv6 not yet supported"} |
| } |
| |
| addr := fidlconv.ToTCPIPAddress(address) |
| |
| if (8 * len(addr)) < int(prefixLen) { |
| return 0, "", netstack.NetErr{Status: netstack.StatusParseError, Message: "prefix length exceeds address length"} |
| } |
| |
| return protocol, addr, netstack.NetErr{Status: netstack.StatusOk} |
| } |
