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1555 lines
44 KiB
Go
1555 lines
44 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package wgengine
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import (
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"bufio"
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"bytes"
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crand "crypto/rand"
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"errors"
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"fmt"
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"io"
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"os"
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"reflect"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"go4.org/mem"
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"golang.zx2c4.com/wireguard/device"
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"golang.zx2c4.com/wireguard/tun"
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"inet.af/netaddr"
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"tailscale.com/control/controlclient"
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"tailscale.com/health"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/net/dns"
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"tailscale.com/net/dns/resolver"
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"tailscale.com/net/flowtrack"
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"tailscale.com/net/interfaces"
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"tailscale.com/net/packet"
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"tailscale.com/net/tsaddr"
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"tailscale.com/net/tshttpproxy"
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"tailscale.com/net/tstun"
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"tailscale.com/tailcfg"
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"tailscale.com/tstime/mono"
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"tailscale.com/types/dnstype"
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"tailscale.com/types/ipproto"
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"tailscale.com/types/key"
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"tailscale.com/types/logger"
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"tailscale.com/types/netmap"
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"tailscale.com/types/wgkey"
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"tailscale.com/util/deephash"
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"tailscale.com/version"
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"tailscale.com/wgengine/filter"
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"tailscale.com/wgengine/magicsock"
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"tailscale.com/wgengine/monitor"
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"tailscale.com/wgengine/router"
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"tailscale.com/wgengine/wgcfg"
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"tailscale.com/wgengine/wglog"
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)
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const magicDNSPort = 53
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var magicDNSIP = netaddr.IPv4(100, 100, 100, 100)
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// Lazy wireguard-go configuration parameters.
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const (
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// lazyPeerIdleThreshold is the idle duration after
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// which we remove a peer from the wireguard configuration.
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// (This includes peers that have never been idle, which
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// effectively have infinite idleness)
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lazyPeerIdleThreshold = 5 * time.Minute
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// packetSendTimeUpdateFrequency controls how often we record
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// the time that we wrote a packet to an IP address.
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packetSendTimeUpdateFrequency = 10 * time.Second
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// packetSendRecheckWireguardThreshold controls how long we can go
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// between packet sends to an IP before checking to see
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// whether this IP address needs to be added back to the
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// Wireguard peer oconfig.
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packetSendRecheckWireguardThreshold = 1 * time.Minute
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)
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// statusPollInterval is how often we ask wireguard-go for its engine
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// status (as long as there's activity). See docs on its use below.
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const statusPollInterval = 1 * time.Minute
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type userspaceEngine struct {
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logf logger.Logf
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wgLogger *wglog.Logger //a wireguard-go logging wrapper
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reqCh chan struct{}
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waitCh chan struct{} // chan is closed when first Close call completes; contrast with closing bool
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timeNow func() mono.Time
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tundev *tstun.Wrapper
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wgdev *device.Device
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router router.Router
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confListenPort uint16 // original conf.ListenPort
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dns *dns.Manager
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magicConn *magicsock.Conn
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linkMon *monitor.Mon
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linkMonOwned bool // whether we created linkMon (and thus need to close it)
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linkMonUnregister func() // unsubscribes from changes; used regardless of linkMonOwned
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birdClient BIRDClient // or nil
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testMaybeReconfigHook func() // for tests; if non-nil, fires if maybeReconfigWireguardLocked called
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// isLocalAddr reports the whether an IP is assigned to the local
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// tunnel interface. It's used to reflect local packets
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// incorrectly sent to us.
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isLocalAddr atomic.Value // of func(netaddr.IP)bool
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// isDNSIPOverTailscale reports the whether a DNS resolver's IP
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// is being routed over Tailscale.
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isDNSIPOverTailscale atomic.Value // of func(netaddr.IP)bool
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wgLock sync.Mutex // serializes all wgdev operations; see lock order comment below
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lastCfgFull wgcfg.Config
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lastNMinPeers int
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lastRouterSig deephash.Sum // of router.Config
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lastEngineSigFull deephash.Sum // of full wireguard config
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lastEngineSigTrim deephash.Sum // of trimmed wireguard config
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lastDNSConfig *dns.Config
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recvActivityAt map[tailcfg.NodeKey]mono.Time
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trimmedNodes map[tailcfg.NodeKey]bool // set of node keys of peers currently excluded from wireguard config
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sentActivityAt map[netaddr.IP]*mono.Time // value is accessed atomically
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destIPActivityFuncs map[netaddr.IP]func()
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statusBufioReader *bufio.Reader // reusable for UAPI
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lastStatusPollTime mono.Time // last time we polled the engine status
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lastIsSubnetRouter bool // was the node a primary subnet router in the last run.
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mu sync.Mutex // guards following; see lock order comment below
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netMap *netmap.NetworkMap // or nil
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closing bool // Close was called (even if we're still closing)
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statusCallback StatusCallback
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peerSequence []wgkey.Key
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endpoints []tailcfg.Endpoint
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pendOpen map[flowtrack.Tuple]*pendingOpenFlow // see pendopen.go
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networkMapCallbacks map[*someHandle]NetworkMapCallback
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tsIPByIPPort map[netaddr.IPPort]netaddr.IP // allows registration of IP:ports as belonging to a certain Tailscale IP for whois lookups
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pongCallback map[[8]byte]func(packet.TSMPPongReply) // for TSMP pong responses
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// Lock ordering: magicsock.Conn.mu, wgLock, then mu.
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}
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// InternalsGetter is implemented by Engines that can export their internals.
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type InternalsGetter interface {
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GetInternals() (_ *tstun.Wrapper, _ *magicsock.Conn, ok bool)
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}
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func (e *userspaceEngine) GetInternals() (_ *tstun.Wrapper, _ *magicsock.Conn, ok bool) {
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return e.tundev, e.magicConn, true
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}
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// BIRDClient handles communication with the BIRD Internet Routing Daemon.
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type BIRDClient interface {
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EnableProtocol(proto string) error
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DisableProtocol(proto string) error
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Close() error
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}
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// Config is the engine configuration.
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type Config struct {
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// Tun is the device used by the Engine to exchange packets with
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// the OS.
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// If nil, a fake Device that does nothing is used.
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Tun tun.Device
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// IsTAP is whether Tun is actually a TAP (Layer 2) device that'll
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// require ethernet headers.
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IsTAP bool
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// Router interfaces the Engine to the OS network stack.
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// If nil, a fake Router that does nothing is used.
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Router router.Router
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// DNS interfaces the Engine to the OS DNS resolver configuration.
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// If nil, a fake OSConfigurator that does nothing is used.
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DNS dns.OSConfigurator
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// LinkMonitor optionally provides an existing link monitor to re-use.
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// If nil, a new link monitor is created.
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LinkMonitor *monitor.Mon
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// ListenPort is the port on which the engine will listen.
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// If zero, a port is automatically selected.
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ListenPort uint16
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// RespondToPing determines whether this engine should internally
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// reply to ICMP pings, without involving the OS.
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// Used in "fake" mode for development.
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RespondToPing bool
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// BIRDClient, if non-nil, will be used to configure BIRD whenever
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// this node is a primary subnet router.
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BIRDClient BIRDClient
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}
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func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16) (Engine, error) {
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logf("Starting userspace wireguard engine (with fake TUN device)")
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return NewUserspaceEngine(logf, Config{
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ListenPort: listenPort,
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RespondToPing: true,
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})
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}
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// NetstackRouterType is a gross cross-package init-time registration
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// from netstack to here, informing this package of netstack's router
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// type.
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var NetstackRouterType reflect.Type
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// IsNetstackRouter reports whether e is either fully netstack based
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// (without TUN) or is at least using netstack for routing.
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func IsNetstackRouter(e Engine) bool {
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switch e := e.(type) {
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case *userspaceEngine:
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if reflect.TypeOf(e.router) == NetstackRouterType {
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return true
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}
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case *watchdogEngine:
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return IsNetstackRouter(e.wrap)
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}
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return IsNetstack(e)
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}
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// IsNetstack reports whether e is a netstack-based TUN-free engine.
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func IsNetstack(e Engine) bool {
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ig, ok := e.(InternalsGetter)
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if !ok {
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return false
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}
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tw, _, ok := ig.GetInternals()
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if !ok {
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return false
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}
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name, err := tw.Name()
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return err == nil && name == "FakeTUN"
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}
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// NewUserspaceEngine creates the named tun device and returns a
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// Tailscale Engine running on it.
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func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error) {
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var closePool closeOnErrorPool
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defer closePool.closeAllIfError(&reterr)
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if conf.Tun == nil {
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logf("[v1] using fake (no-op) tun device")
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conf.Tun = tstun.NewFake()
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}
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if conf.Router == nil {
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logf("[v1] using fake (no-op) OS network configurator")
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conf.Router = router.NewFake(logf)
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}
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if conf.DNS == nil {
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logf("[v1] using fake (no-op) DNS configurator")
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d, err := dns.NewNoopManager()
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if err != nil {
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return nil, err
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}
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conf.DNS = d
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}
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var tsTUNDev *tstun.Wrapper
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if conf.IsTAP {
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tsTUNDev = tstun.WrapTAP(logf, conf.Tun)
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} else {
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tsTUNDev = tstun.Wrap(logf, conf.Tun)
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}
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closePool.add(tsTUNDev)
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e := &userspaceEngine{
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timeNow: mono.Now,
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logf: logf,
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reqCh: make(chan struct{}, 1),
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waitCh: make(chan struct{}),
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tundev: tsTUNDev,
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router: conf.Router,
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confListenPort: conf.ListenPort,
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birdClient: conf.BIRDClient,
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}
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if e.birdClient != nil {
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// Disable the protocol at start time.
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if err := e.birdClient.DisableProtocol("tailscale"); err != nil {
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return nil, err
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}
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}
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e.isLocalAddr.Store(tsaddr.NewContainsIPFunc(nil))
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e.isDNSIPOverTailscale.Store(tsaddr.NewContainsIPFunc(nil))
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if conf.LinkMonitor != nil {
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e.linkMon = conf.LinkMonitor
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} else {
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mon, err := monitor.New(logf)
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if err != nil {
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return nil, err
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}
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closePool.add(mon)
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e.linkMon = mon
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e.linkMonOwned = true
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}
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tunName, _ := conf.Tun.Name()
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e.dns = dns.NewManager(logf, conf.DNS, e.linkMon, fwdDNSLinkSelector{e, tunName})
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logf("link state: %+v", e.linkMon.InterfaceState())
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unregisterMonWatch := e.linkMon.RegisterChangeCallback(func(changed bool, st *interfaces.State) {
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tshttpproxy.InvalidateCache()
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e.linkChange(changed, st)
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})
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closePool.addFunc(unregisterMonWatch)
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e.linkMonUnregister = unregisterMonWatch
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endpointsFn := func(endpoints []tailcfg.Endpoint) {
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e.mu.Lock()
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e.endpoints = append(e.endpoints[:0], endpoints...)
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e.mu.Unlock()
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e.RequestStatus()
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}
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magicsockOpts := magicsock.Options{
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Logf: logf,
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Port: conf.ListenPort,
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EndpointsFunc: endpointsFn,
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DERPActiveFunc: e.RequestStatus,
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IdleFunc: e.tundev.IdleDuration,
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NoteRecvActivity: e.noteRecvActivity,
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LinkMonitor: e.linkMon,
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}
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var err error
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e.magicConn, err = magicsock.NewConn(magicsockOpts)
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if err != nil {
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return nil, fmt.Errorf("wgengine: %v", err)
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}
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closePool.add(e.magicConn)
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e.magicConn.SetNetworkUp(e.linkMon.InterfaceState().AnyInterfaceUp())
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tsTUNDev.SetDiscoKey(e.magicConn.DiscoPublicKey())
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if conf.RespondToPing {
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e.tundev.PostFilterIn = echoRespondToAll
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}
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e.tundev.PreFilterOut = e.handleLocalPackets
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if debugConnectFailures() {
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if e.tundev.PreFilterIn != nil {
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return nil, errors.New("unexpected PreFilterIn already set")
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}
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e.tundev.PreFilterIn = e.trackOpenPreFilterIn
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if e.tundev.PostFilterOut != nil {
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return nil, errors.New("unexpected PostFilterOut already set")
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}
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e.tundev.PostFilterOut = e.trackOpenPostFilterOut
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}
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e.wgLogger = wglog.NewLogger(logf)
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e.tundev.OnTSMPPongReceived = func(pong packet.TSMPPongReply) {
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e.mu.Lock()
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defer e.mu.Unlock()
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cb := e.pongCallback[pong.Data]
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e.logf("wgengine: got TSMP pong %02x, peerAPIPort=%v; cb=%v", pong.Data, pong.PeerAPIPort, cb != nil)
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if cb != nil {
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go cb(pong)
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}
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}
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// wgdev takes ownership of tundev, will close it when closed.
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e.logf("Creating wireguard device...")
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e.wgdev = device.NewDevice(e.tundev, e.magicConn.Bind(), e.wgLogger.DeviceLogger)
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closePool.addFunc(e.wgdev.Close)
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closePool.addFunc(func() {
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if err := e.magicConn.Close(); err != nil {
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e.logf("error closing magicconn: %v", err)
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}
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})
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go func() {
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up := false
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for event := range e.tundev.EventsUpDown() {
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if event&tun.EventUp != 0 && !up {
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e.logf("external route: up")
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e.RequestStatus()
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up = true
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}
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if event&tun.EventDown != 0 && up {
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e.logf("external route: down")
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e.RequestStatus()
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up = false
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}
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}
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}()
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e.logf("Bringing wireguard device up...")
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e.wgdev.Up()
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e.logf("Bringing router up...")
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if err := e.router.Up(); err != nil {
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return nil, err
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}
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// It's a little pointless to apply no-op settings here (they
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// should already be empty?), but it at least exercises the
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// router implementation early on.
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e.logf("Clearing router settings...")
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if err := e.router.Set(nil); err != nil {
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return nil, err
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}
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e.logf("Starting link monitor...")
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e.linkMon.Start()
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go e.pollResolver()
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e.logf("Engine created.")
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return e, nil
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}
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// echoRespondToAll is an inbound post-filter responding to all echo requests.
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func echoRespondToAll(p *packet.Parsed, t *tstun.Wrapper) filter.Response {
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if p.IsEchoRequest() {
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header := p.ICMP4Header()
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header.ToResponse()
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outp := packet.Generate(&header, p.Payload())
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t.InjectOutbound(outp)
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// We already responded to it, but it's not an error.
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// Proceed with regular delivery. (Since this code is only
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// used in fake mode, regular delivery just means throwing
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// it away. If this ever gets run in non-fake mode, you'll
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// get double responses to pings, which is an indicator you
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// shouldn't be doing that I guess.)
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return filter.Accept
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}
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return filter.Accept
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}
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// handleLocalPackets inspects packets coming from the local network
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// stack, and intercepts any packets that should be handled by
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// tailscaled directly. Other packets are allowed to proceed into the
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// main ACL filter.
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func (e *userspaceEngine) handleLocalPackets(p *packet.Parsed, t *tstun.Wrapper) filter.Response {
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if verdict := e.handleDNS(p, t); verdict == filter.Drop {
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// local DNS handled the packet.
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return filter.Drop
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}
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if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
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isLocalAddr, ok := e.isLocalAddr.Load().(func(netaddr.IP) bool)
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if !ok {
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e.logf("[unexpected] e.isLocalAddr was nil, can't check for loopback packet")
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} else if isLocalAddr(p.Dst.IP()) {
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// macOS NetworkExtension directs packets destined to the
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// tunnel's local IP address into the tunnel, instead of
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// looping back within the kernel network stack. We have to
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// notice that an outbound packet is actually destined for
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// ourselves, and loop it back into macOS.
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t.InjectInboundCopy(p.Buffer())
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return filter.Drop
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}
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}
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return filter.Accept
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}
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// handleDNS is an outbound pre-filter resolving Tailscale domains.
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func (e *userspaceEngine) handleDNS(p *packet.Parsed, t *tstun.Wrapper) filter.Response {
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if p.Dst.IP() == magicDNSIP && p.Dst.Port() == magicDNSPort && p.IPProto == ipproto.UDP {
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err := e.dns.EnqueueRequest(append([]byte(nil), p.Payload()...), p.Src)
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if err != nil {
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e.logf("dns: enqueue: %v", err)
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}
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return filter.Drop
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}
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return filter.Accept
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}
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// pollResolver reads responses from the DNS resolver and injects them inbound.
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func (e *userspaceEngine) pollResolver() {
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for {
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bs, to, err := e.dns.NextResponse()
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if err == resolver.ErrClosed {
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return
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}
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if err != nil {
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e.logf("dns: error: %v", err)
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continue
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}
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h := packet.UDP4Header{
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IP4Header: packet.IP4Header{
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Src: magicDNSIP,
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Dst: to.IP(),
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},
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SrcPort: magicDNSPort,
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DstPort: to.Port(),
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}
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hlen := h.Len()
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// TODO(dmytro): avoid this allocation without importing tstun quirks into dns.
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const offset = tstun.PacketStartOffset
|
|
buf := make([]byte, offset+hlen+len(bs))
|
|
copy(buf[offset+hlen:], bs)
|
|
h.Marshal(buf[offset:])
|
|
|
|
e.tundev.InjectInboundDirect(buf, offset)
|
|
}
|
|
}
|
|
|
|
var (
|
|
debugTrimWireguardEnv = os.Getenv("TS_DEBUG_TRIM_WIREGUARD")
|
|
debugTrimWireguard, _ = strconv.ParseBool(debugTrimWireguardEnv)
|
|
)
|
|
|
|
// forceFullWireguardConfig reports whether we should give wireguard
|
|
// our full network map, even for inactive peers
|
|
//
|
|
// TODO(bradfitz): remove this after our 1.0 launch; we don't want to
|
|
// enable wireguard config trimming quite yet because it just landed
|
|
// and we haven't got enough time testing it.
|
|
func forceFullWireguardConfig(numPeers int) bool {
|
|
// Did the user explicitly enable trimmming via the environment variable knob?
|
|
if debugTrimWireguardEnv != "" {
|
|
return !debugTrimWireguard
|
|
}
|
|
if opt := controlclient.TrimWGConfig(); opt != "" {
|
|
return !opt.EqualBool(true)
|
|
}
|
|
|
|
// On iOS with large networks, it's critical, so turn on trimming.
|
|
// Otherwise we run out of memory from wireguard-go goroutine stacks+buffers.
|
|
// This will be the default later for all platforms and network sizes.
|
|
if numPeers > 50 && version.OS() == "iOS" {
|
|
return false
|
|
}
|
|
return false
|
|
}
|
|
|
|
// isTrimmablePeer reports whether p is a peer that we can trim out of the
|
|
// network map.
|
|
//
|
|
// For implementation simplificy, we can only trim peers that have
|
|
// only non-subnet AllowedIPs (an IPv4 /32 or IPv6 /128), which is the
|
|
// common case for most peers. Subnet router nodes will just always be
|
|
// created in the wireguard-go config.
|
|
func isTrimmablePeer(p *wgcfg.Peer, numPeers int) bool {
|
|
if forceFullWireguardConfig(numPeers) {
|
|
return false
|
|
}
|
|
|
|
// AllowedIPs must all be single IPs, not subnets.
|
|
for _, aip := range p.AllowedIPs {
|
|
if !aip.IsSingleIP() {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// noteRecvActivity is called by magicsock when a packet has been
|
|
// received for the peer with node key nk. Magicsock calls this no
|
|
// more than every 10 seconds for a given peer.
|
|
func (e *userspaceEngine) noteRecvActivity(nk tailcfg.NodeKey) {
|
|
e.wgLock.Lock()
|
|
defer e.wgLock.Unlock()
|
|
|
|
if _, ok := e.recvActivityAt[nk]; !ok {
|
|
// Not a trimmable peer we care about tracking. (See isTrimmablePeer)
|
|
if e.trimmedNodes[nk] {
|
|
e.logf("wgengine: [unexpected] noteReceiveActivity called on idle node %v that's not in recvActivityAt", nk.ShortString())
|
|
}
|
|
return
|
|
}
|
|
now := e.timeNow()
|
|
e.recvActivityAt[nk] = now
|
|
|
|
// As long as there's activity, periodically poll the engine to get
|
|
// stats for the far away side effect of
|
|
// ipn/ipnlocal.LocalBackend.parseWgStatusLocked to log activity, for
|
|
// use in various admin dashboards.
|
|
// This particularly matters on platforms without a connected GUI, as
|
|
// the GUIs generally poll this enough to cause that logging. But
|
|
// tailscaled alone did not, hence this.
|
|
if e.lastStatusPollTime.IsZero() || now.Sub(e.lastStatusPollTime) >= statusPollInterval {
|
|
e.lastStatusPollTime = now
|
|
go e.RequestStatus()
|
|
}
|
|
|
|
// If the last activity time jumped a bunch (say, at least
|
|
// half the idle timeout) then see if we need to reprogram
|
|
// Wireguard. This could probably be just
|
|
// lazyPeerIdleThreshold without the divide by 2, but
|
|
// maybeReconfigWireguardLocked is cheap enough to call every
|
|
// couple minutes (just not on every packet).
|
|
if e.trimmedNodes[nk] {
|
|
e.logf("wgengine: idle peer %v now active, reconfiguring wireguard", nk.ShortString())
|
|
e.maybeReconfigWireguardLocked(nil)
|
|
}
|
|
}
|
|
|
|
// isActiveSinceLocked reports whether the peer identified by (nk, ip)
|
|
// has had a packet sent to or received from it since t.
|
|
//
|
|
// e.wgLock must be held.
|
|
func (e *userspaceEngine) isActiveSinceLocked(nk tailcfg.NodeKey, ip netaddr.IP, t mono.Time) bool {
|
|
if e.recvActivityAt[nk].After(t) {
|
|
return true
|
|
}
|
|
timePtr, ok := e.sentActivityAt[ip]
|
|
if !ok {
|
|
return false
|
|
}
|
|
return timePtr.LoadAtomic().After(t)
|
|
}
|
|
|
|
// discoChanged are the set of peers whose disco keys have changed, implying they've restarted.
|
|
// If a peer is in this set and was previously in the live wireguard config,
|
|
// it needs to be first removed and then re-added to flush out its wireguard session key.
|
|
// If discoChanged is nil or empty, this extra removal step isn't done.
|
|
//
|
|
// e.wgLock must be held.
|
|
func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[tailcfg.NodeKey]bool) error {
|
|
if hook := e.testMaybeReconfigHook; hook != nil {
|
|
hook()
|
|
return nil
|
|
}
|
|
|
|
full := e.lastCfgFull
|
|
e.wgLogger.SetPeers(full.Peers)
|
|
|
|
// Compute a minimal config to pass to wireguard-go
|
|
// based on the full config. Prune off all the peers
|
|
// and only add the active ones back.
|
|
min := full
|
|
min.Peers = make([]wgcfg.Peer, 0, e.lastNMinPeers)
|
|
|
|
// We'll only keep a peer around if it's been active in
|
|
// the past 5 minutes. That's more than WireGuard's key
|
|
// rotation time anyway so it's no harm if we remove it
|
|
// later if it's been inactive.
|
|
activeCutoff := e.timeNow().Add(-lazyPeerIdleThreshold)
|
|
|
|
// Not all peers can be trimmed from the network map (see
|
|
// isTrimmablePeer). For those are are trimmable, keep track of
|
|
// their NodeKey and Tailscale IPs. These are the ones we'll need
|
|
// to install tracking hooks for to watch their send/receive
|
|
// activity.
|
|
trackNodes := make([]tailcfg.NodeKey, 0, len(full.Peers))
|
|
trackIPs := make([]netaddr.IP, 0, len(full.Peers))
|
|
|
|
trimmedNodes := map[tailcfg.NodeKey]bool{} // TODO: don't re-alloc this map each time
|
|
|
|
needRemoveStep := false
|
|
for i := range full.Peers {
|
|
p := &full.Peers[i]
|
|
nk := tailcfg.NodeKey(p.PublicKey)
|
|
if !isTrimmablePeer(p, len(full.Peers)) {
|
|
min.Peers = append(min.Peers, *p)
|
|
if discoChanged[nk] {
|
|
needRemoveStep = true
|
|
}
|
|
continue
|
|
}
|
|
trackNodes = append(trackNodes, nk)
|
|
recentlyActive := false
|
|
for _, cidr := range p.AllowedIPs {
|
|
trackIPs = append(trackIPs, cidr.IP())
|
|
recentlyActive = recentlyActive || e.isActiveSinceLocked(nk, cidr.IP(), activeCutoff)
|
|
}
|
|
if recentlyActive {
|
|
min.Peers = append(min.Peers, *p)
|
|
if discoChanged[tailcfg.NodeKey(p.PublicKey)] {
|
|
needRemoveStep = true
|
|
}
|
|
} else {
|
|
trimmedNodes[tailcfg.NodeKey(p.PublicKey)] = true
|
|
}
|
|
}
|
|
e.lastNMinPeers = len(min.Peers)
|
|
|
|
if !deephash.Update(&e.lastEngineSigTrim, &min, trimmedNodes, trackNodes, trackIPs) {
|
|
// No changes
|
|
return nil
|
|
}
|
|
|
|
e.trimmedNodes = trimmedNodes
|
|
|
|
e.updateActivityMapsLocked(trackNodes, trackIPs)
|
|
|
|
if needRemoveStep {
|
|
minner := min
|
|
minner.Peers = nil
|
|
numRemove := 0
|
|
for _, p := range min.Peers {
|
|
if discoChanged[tailcfg.NodeKey(p.PublicKey)] {
|
|
numRemove++
|
|
continue
|
|
}
|
|
minner.Peers = append(minner.Peers, p)
|
|
}
|
|
if numRemove > 0 {
|
|
e.logf("wgengine: Reconfig: removing session keys for %d peers", numRemove)
|
|
if err := wgcfg.ReconfigDevice(e.wgdev, &minner, e.logf); err != nil {
|
|
e.logf("wgdev.Reconfig: %v", err)
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
e.logf("wgengine: Reconfig: configuring userspace wireguard config (with %d/%d peers)", len(min.Peers), len(full.Peers))
|
|
if err := wgcfg.ReconfigDevice(e.wgdev, &min, e.logf); err != nil {
|
|
e.logf("wgdev.Reconfig: %v", err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// updateActivityMapsLocked updates the data structures used for tracking the activity
|
|
// of wireguard peers that we might add/remove dynamically from the real config
|
|
// as given to wireguard-go.
|
|
//
|
|
// e.wgLock must be held.
|
|
func (e *userspaceEngine) updateActivityMapsLocked(trackNodes []tailcfg.NodeKey, trackIPs []netaddr.IP) {
|
|
// Generate the new map of which nodekeys we want to track
|
|
// receive times for.
|
|
mr := map[tailcfg.NodeKey]mono.Time{} // TODO: only recreate this if set of keys changed
|
|
for _, nk := range trackNodes {
|
|
// Preserve old times in the new map, but also
|
|
// populate map entries for new trackNodes values with
|
|
// time.Time{} zero values. (Only entries in this map
|
|
// are tracked, so the Time zero values allow it to be
|
|
// tracked later)
|
|
mr[nk] = e.recvActivityAt[nk]
|
|
}
|
|
e.recvActivityAt = mr
|
|
|
|
oldTime := e.sentActivityAt
|
|
e.sentActivityAt = make(map[netaddr.IP]*mono.Time, len(oldTime))
|
|
oldFunc := e.destIPActivityFuncs
|
|
e.destIPActivityFuncs = make(map[netaddr.IP]func(), len(oldFunc))
|
|
|
|
updateFn := func(timePtr *mono.Time) func() {
|
|
return func() {
|
|
now := e.timeNow()
|
|
old := timePtr.LoadAtomic()
|
|
|
|
// How long's it been since we last sent a packet?
|
|
elapsed := now.Sub(old)
|
|
if old == 0 {
|
|
// For our first packet, old is 0, which has indeterminate meaning.
|
|
// Set elapsed to a big number (four score and seven years).
|
|
elapsed = 762642 * time.Hour
|
|
}
|
|
|
|
if elapsed >= packetSendTimeUpdateFrequency {
|
|
timePtr.StoreAtomic(now)
|
|
}
|
|
// On a big jump, assume we might no longer be in the wireguard
|
|
// config and go check.
|
|
if elapsed >= packetSendRecheckWireguardThreshold {
|
|
e.wgLock.Lock()
|
|
defer e.wgLock.Unlock()
|
|
e.maybeReconfigWireguardLocked(nil)
|
|
}
|
|
}
|
|
}
|
|
|
|
for _, ip := range trackIPs {
|
|
timePtr := oldTime[ip]
|
|
if timePtr == nil {
|
|
timePtr = new(mono.Time)
|
|
}
|
|
e.sentActivityAt[ip] = timePtr
|
|
|
|
fn := oldFunc[ip]
|
|
if fn == nil {
|
|
fn = updateFn(timePtr)
|
|
}
|
|
e.destIPActivityFuncs[ip] = fn
|
|
}
|
|
e.tundev.SetDestIPActivityFuncs(e.destIPActivityFuncs)
|
|
}
|
|
|
|
// hasOverlap checks if there is a IPPrefix which is common amongst the two
|
|
// provided slices.
|
|
func hasOverlap(aips, rips []netaddr.IPPrefix) bool {
|
|
for _, aip := range aips {
|
|
for _, rip := range rips {
|
|
if aip == rip {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config, dnsCfg *dns.Config, debug *tailcfg.Debug) error {
|
|
if routerCfg == nil {
|
|
panic("routerCfg must not be nil")
|
|
}
|
|
if dnsCfg == nil {
|
|
panic("dnsCfg must not be nil")
|
|
}
|
|
|
|
e.isLocalAddr.Store(tsaddr.NewContainsIPFunc(routerCfg.LocalAddrs))
|
|
|
|
e.wgLock.Lock()
|
|
defer e.wgLock.Unlock()
|
|
e.lastDNSConfig = dnsCfg
|
|
|
|
peerSet := make(map[key.Public]struct{}, len(cfg.Peers))
|
|
e.mu.Lock()
|
|
e.peerSequence = e.peerSequence[:0]
|
|
for _, p := range cfg.Peers {
|
|
e.peerSequence = append(e.peerSequence, wgkey.Key(p.PublicKey))
|
|
peerSet[key.Public(p.PublicKey)] = struct{}{}
|
|
}
|
|
e.mu.Unlock()
|
|
|
|
listenPort := e.confListenPort
|
|
if debug != nil && debug.RandomizeClientPort {
|
|
listenPort = 0
|
|
}
|
|
|
|
isSubnetRouter := false
|
|
if e.birdClient != nil {
|
|
isSubnetRouter = hasOverlap(e.netMap.SelfNode.PrimaryRoutes, e.netMap.Hostinfo.RoutableIPs)
|
|
}
|
|
isSubnetRouterChanged := isSubnetRouter != e.lastIsSubnetRouter
|
|
|
|
engineChanged := deephash.Update(&e.lastEngineSigFull, cfg)
|
|
routerChanged := deephash.Update(&e.lastRouterSig, routerCfg, dnsCfg)
|
|
if !engineChanged && !routerChanged && listenPort == e.magicConn.LocalPort() && !isSubnetRouterChanged {
|
|
return ErrNoChanges
|
|
}
|
|
|
|
// TODO(bradfitz,danderson): maybe delete this isDNSIPOverTailscale
|
|
// field and delete the resolver.ForwardLinkSelector hook and
|
|
// instead have ipnlocal populate a map of DNS IP => linkName and
|
|
// put that in the *dns.Config instead, and plumb it down to the
|
|
// dns.Manager. Maybe also with isLocalAddr above.
|
|
e.isDNSIPOverTailscale.Store(tsaddr.NewContainsIPFunc(dnsIPsOverTailscale(dnsCfg, routerCfg)))
|
|
|
|
// See if any peers have changed disco keys, which means they've restarted.
|
|
// If so, we need to update the wireguard-go/device.Device in two phases:
|
|
// once without the node which has restarted, to clear its wireguard session key,
|
|
// and a second time with it.
|
|
discoChanged := make(map[tailcfg.NodeKey]bool)
|
|
{
|
|
prevEP := make(map[tailcfg.NodeKey]tailcfg.DiscoKey)
|
|
for i := range e.lastCfgFull.Peers {
|
|
if p := &e.lastCfgFull.Peers[i]; !p.DiscoKey.IsZero() {
|
|
prevEP[tailcfg.NodeKey(p.PublicKey)] = p.DiscoKey
|
|
}
|
|
}
|
|
for i := range cfg.Peers {
|
|
p := &cfg.Peers[i]
|
|
if p.DiscoKey.IsZero() {
|
|
continue
|
|
}
|
|
pub := tailcfg.NodeKey(p.PublicKey)
|
|
if old, ok := prevEP[pub]; ok && old != p.DiscoKey {
|
|
discoChanged[pub] = true
|
|
e.logf("wgengine: Reconfig: %s changed from %q to %q", pub.ShortString(), old, p.DiscoKey)
|
|
}
|
|
}
|
|
}
|
|
|
|
e.lastCfgFull = *cfg.Clone()
|
|
|
|
// Tell magicsock about the new (or initial) private key
|
|
// (which is needed by DERP) before wgdev gets it, as wgdev
|
|
// will start trying to handshake, which we want to be able to
|
|
// go over DERP.
|
|
if err := e.magicConn.SetPrivateKey(wgkey.Private(cfg.PrivateKey)); err != nil {
|
|
e.logf("wgengine: Reconfig: SetPrivateKey: %v", err)
|
|
}
|
|
e.magicConn.UpdatePeers(peerSet)
|
|
e.magicConn.SetPreferredPort(listenPort)
|
|
|
|
if err := e.maybeReconfigWireguardLocked(discoChanged); err != nil {
|
|
return err
|
|
}
|
|
|
|
if routerChanged {
|
|
e.logf("wgengine: Reconfig: configuring router")
|
|
err := e.router.Set(routerCfg)
|
|
health.SetRouterHealth(err)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Keep DNS configuration after router configuration, as some
|
|
// DNS managers refuse to apply settings if the device has no
|
|
// assigned address.
|
|
e.logf("wgengine: Reconfig: configuring DNS")
|
|
err = e.dns.Set(*dnsCfg)
|
|
health.SetDNSHealth(err)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if isSubnetRouterChanged && e.birdClient != nil {
|
|
e.logf("wgengine: Reconfig: configuring BIRD")
|
|
var err error
|
|
if isSubnetRouter {
|
|
err = e.birdClient.EnableProtocol("tailscale")
|
|
} else {
|
|
err = e.birdClient.DisableProtocol("tailscale")
|
|
}
|
|
if err != nil {
|
|
// Log but don't fail here.
|
|
e.logf("wgengine: error configuring BIRD: %v", err)
|
|
} else {
|
|
e.lastIsSubnetRouter = isSubnetRouter
|
|
}
|
|
}
|
|
|
|
e.logf("[v1] wgengine: Reconfig done")
|
|
return nil
|
|
}
|
|
|
|
func (e *userspaceEngine) GetFilter() *filter.Filter {
|
|
return e.tundev.GetFilter()
|
|
}
|
|
|
|
func (e *userspaceEngine) SetFilter(filt *filter.Filter) {
|
|
e.tundev.SetFilter(filt)
|
|
}
|
|
|
|
func (e *userspaceEngine) SetStatusCallback(cb StatusCallback) {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
e.statusCallback = cb
|
|
}
|
|
|
|
func (e *userspaceEngine) getStatusCallback() StatusCallback {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
return e.statusCallback
|
|
}
|
|
|
|
var singleNewline = []byte{'\n'}
|
|
|
|
var ErrEngineClosing = errors.New("engine closing; no status")
|
|
|
|
func (e *userspaceEngine) getStatus() (*Status, error) {
|
|
// Grab derpConns before acquiring wgLock to not violate lock ordering;
|
|
// the DERPs method acquires magicsock.Conn.mu.
|
|
// (See comment in userspaceEngine's declaration.)
|
|
derpConns := e.magicConn.DERPs()
|
|
|
|
e.wgLock.Lock()
|
|
defer e.wgLock.Unlock()
|
|
|
|
e.mu.Lock()
|
|
closing := e.closing
|
|
e.mu.Unlock()
|
|
if closing {
|
|
return nil, ErrEngineClosing
|
|
}
|
|
|
|
if e.wgdev == nil {
|
|
// RequestStatus was invoked before the wgengine has
|
|
// finished initializing. This can happen when wgegine
|
|
// provides a callback to magicsock for endpoint
|
|
// updates that calls RequestStatus.
|
|
return nil, nil
|
|
}
|
|
|
|
pr, pw := io.Pipe()
|
|
defer pr.Close() // to unblock writes on error path returns
|
|
|
|
errc := make(chan error, 1)
|
|
go func() {
|
|
defer pw.Close()
|
|
// TODO(apenwarr): get rid of silly uapi stuff for in-process comms
|
|
// FIXME: get notified of status changes instead of polling.
|
|
err := e.wgdev.IpcGetOperation(pw)
|
|
if err != nil {
|
|
err = fmt.Errorf("IpcGetOperation: %w", err)
|
|
}
|
|
errc <- err
|
|
}()
|
|
|
|
pp := make(map[wgkey.Key]ipnstate.PeerStatusLite)
|
|
var p ipnstate.PeerStatusLite
|
|
|
|
var hst1, hst2, n int64
|
|
|
|
br := e.statusBufioReader
|
|
if br != nil {
|
|
br.Reset(pr)
|
|
} else {
|
|
br = bufio.NewReaderSize(pr, 1<<10)
|
|
e.statusBufioReader = br
|
|
}
|
|
for {
|
|
line, err := br.ReadSlice('\n')
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
return nil, fmt.Errorf("reading from UAPI pipe: %w", err)
|
|
}
|
|
line = bytes.TrimSuffix(line, singleNewline)
|
|
k := line
|
|
var v mem.RO
|
|
if i := bytes.IndexByte(line, '='); i != -1 {
|
|
k = line[:i]
|
|
v = mem.B(line[i+1:])
|
|
}
|
|
switch string(k) {
|
|
case "public_key":
|
|
pk, err := key.NewPublicFromHexMem(v)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("IpcGetOperation: invalid key in line %q", line)
|
|
}
|
|
if !p.NodeKey.IsZero() {
|
|
pp[wgkey.Key(p.NodeKey)] = p
|
|
}
|
|
p = ipnstate.PeerStatusLite{NodeKey: tailcfg.NodeKey(pk)}
|
|
case "rx_bytes":
|
|
n, err = mem.ParseInt(v, 10, 64)
|
|
p.RxBytes = n
|
|
if err != nil {
|
|
return nil, fmt.Errorf("IpcGetOperation: rx_bytes invalid: %#v", line)
|
|
}
|
|
case "tx_bytes":
|
|
n, err = mem.ParseInt(v, 10, 64)
|
|
p.TxBytes = n
|
|
if err != nil {
|
|
return nil, fmt.Errorf("IpcGetOperation: tx_bytes invalid: %#v", line)
|
|
}
|
|
case "last_handshake_time_sec":
|
|
hst1, err = mem.ParseInt(v, 10, 64)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("IpcGetOperation: hst1 invalid: %#v", line)
|
|
}
|
|
case "last_handshake_time_nsec":
|
|
hst2, err = mem.ParseInt(v, 10, 64)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("IpcGetOperation: hst2 invalid: %#v", line)
|
|
}
|
|
if hst1 != 0 || hst2 != 0 {
|
|
p.LastHandshake = time.Unix(hst1, hst2)
|
|
} // else leave at time.IsZero()
|
|
}
|
|
}
|
|
if !p.NodeKey.IsZero() {
|
|
pp[wgkey.Key(p.NodeKey)] = p
|
|
}
|
|
if err := <-errc; err != nil {
|
|
return nil, fmt.Errorf("IpcGetOperation: %v", err)
|
|
}
|
|
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
|
|
// Do two passes, one to calculate size and the other to populate.
|
|
// This code is sensitive to allocations.
|
|
npeers := 0
|
|
for _, pk := range e.peerSequence {
|
|
if _, ok := pp[pk]; ok { // ignore idle ones not in wireguard-go's config
|
|
npeers++
|
|
}
|
|
}
|
|
|
|
peers := make([]ipnstate.PeerStatusLite, 0, npeers)
|
|
for _, pk := range e.peerSequence {
|
|
if p, ok := pp[pk]; ok { // ignore idle ones not in wireguard-go's config
|
|
peers = append(peers, p)
|
|
}
|
|
}
|
|
|
|
return &Status{
|
|
LocalAddrs: append([]tailcfg.Endpoint(nil), e.endpoints...),
|
|
Peers: peers,
|
|
DERPs: derpConns,
|
|
}, nil
|
|
}
|
|
|
|
func (e *userspaceEngine) RequestStatus() {
|
|
// This is slightly tricky. e.getStatus() can theoretically get
|
|
// blocked inside wireguard for a while, and RequestStatus() is
|
|
// sometimes called from a goroutine, so we don't want a lot of
|
|
// them hanging around. On the other hand, requesting multiple
|
|
// status updates simultaneously is pointless anyway; they will
|
|
// all say the same thing.
|
|
|
|
// Enqueue at most one request. If one is in progress already, this
|
|
// adds one more to the queue. If one has been requested but not
|
|
// started, it is a no-op.
|
|
select {
|
|
case e.reqCh <- struct{}{}:
|
|
default:
|
|
}
|
|
|
|
// Dequeue at most one request. Another thread may have already
|
|
// dequeued the request we enqueued above, which is fine, since the
|
|
// information is guaranteed to be at least as recent as the current
|
|
// call to RequestStatus().
|
|
select {
|
|
case <-e.reqCh:
|
|
s, err := e.getStatus()
|
|
if s == nil && err == nil {
|
|
e.logf("[unexpected] RequestStatus: both s and err are nil")
|
|
return
|
|
}
|
|
if cb := e.getStatusCallback(); cb != nil {
|
|
cb(s, err)
|
|
}
|
|
default:
|
|
}
|
|
}
|
|
|
|
func (e *userspaceEngine) Close() {
|
|
e.mu.Lock()
|
|
if e.closing {
|
|
e.mu.Unlock()
|
|
return
|
|
}
|
|
e.closing = true
|
|
e.mu.Unlock()
|
|
|
|
r := bufio.NewReader(strings.NewReader(""))
|
|
e.wgdev.IpcSetOperation(r)
|
|
e.magicConn.Close()
|
|
e.linkMonUnregister()
|
|
if e.linkMonOwned {
|
|
e.linkMon.Close()
|
|
}
|
|
e.dns.Down()
|
|
e.router.Close()
|
|
e.wgdev.Close()
|
|
e.tundev.Close()
|
|
if e.birdClient != nil {
|
|
e.birdClient.DisableProtocol("tailscale")
|
|
e.birdClient.Close()
|
|
}
|
|
close(e.waitCh)
|
|
}
|
|
|
|
func (e *userspaceEngine) Wait() {
|
|
<-e.waitCh
|
|
}
|
|
|
|
func (e *userspaceEngine) GetLinkMonitor() *monitor.Mon {
|
|
return e.linkMon
|
|
}
|
|
|
|
// LinkChange signals a network change event. It's currently
|
|
// (2021-03-03) only called on Android.
|
|
func (e *userspaceEngine) LinkChange(_ bool) {
|
|
e.linkMon.InjectEvent()
|
|
}
|
|
|
|
func (e *userspaceEngine) linkChange(changed bool, cur *interfaces.State) {
|
|
up := cur.AnyInterfaceUp()
|
|
if !up {
|
|
e.logf("LinkChange: all links down; pausing: %v", cur)
|
|
} else if changed {
|
|
e.logf("LinkChange: major, rebinding. New state: %v", cur)
|
|
} else {
|
|
e.logf("[v1] LinkChange: minor")
|
|
}
|
|
|
|
health.SetAnyInterfaceUp(up)
|
|
e.magicConn.SetNetworkUp(up)
|
|
if !up || changed {
|
|
if err := e.dns.FlushCaches(); err != nil {
|
|
e.logf("wgengine: dns flush failed after major link change: %v", err)
|
|
}
|
|
}
|
|
|
|
// Hacky workaround for Linux DNS issue 2458: on
|
|
// suspend/resume or whenever NetworkManager is started, it
|
|
// nukes all systemd-resolved configs. So reapply our DNS
|
|
// config on major link change.
|
|
if runtime.GOOS == "linux" && changed {
|
|
e.wgLock.Lock()
|
|
dnsCfg := e.lastDNSConfig
|
|
e.wgLock.Unlock()
|
|
if dnsCfg != nil {
|
|
if err := e.dns.Set(*dnsCfg); err != nil {
|
|
e.logf("wgengine: error setting DNS config after major link change: %v", err)
|
|
} else {
|
|
e.logf("wgengine: set DNS config again after major link change")
|
|
}
|
|
}
|
|
}
|
|
|
|
why := "link-change-minor"
|
|
if changed {
|
|
why = "link-change-major"
|
|
e.magicConn.Rebind()
|
|
}
|
|
e.magicConn.ReSTUN(why)
|
|
}
|
|
|
|
func (e *userspaceEngine) AddNetworkMapCallback(cb NetworkMapCallback) func() {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
if e.networkMapCallbacks == nil {
|
|
e.networkMapCallbacks = make(map[*someHandle]NetworkMapCallback)
|
|
}
|
|
h := new(someHandle)
|
|
e.networkMapCallbacks[h] = cb
|
|
return func() {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
delete(e.networkMapCallbacks, h)
|
|
}
|
|
}
|
|
|
|
func (e *userspaceEngine) SetNetInfoCallback(cb NetInfoCallback) {
|
|
e.magicConn.SetNetInfoCallback(cb)
|
|
}
|
|
|
|
func (e *userspaceEngine) SetDERPMap(dm *tailcfg.DERPMap) {
|
|
e.magicConn.SetDERPMap(dm)
|
|
}
|
|
|
|
func (e *userspaceEngine) SetNetworkMap(nm *netmap.NetworkMap) {
|
|
e.magicConn.SetNetworkMap(nm)
|
|
e.mu.Lock()
|
|
e.netMap = nm
|
|
callbacks := make([]NetworkMapCallback, 0, 4)
|
|
for _, fn := range e.networkMapCallbacks {
|
|
callbacks = append(callbacks, fn)
|
|
}
|
|
e.mu.Unlock()
|
|
for _, fn := range callbacks {
|
|
fn(nm)
|
|
}
|
|
}
|
|
|
|
func (e *userspaceEngine) DiscoPublicKey() tailcfg.DiscoKey {
|
|
return e.magicConn.DiscoPublicKey()
|
|
}
|
|
|
|
func (e *userspaceEngine) UpdateStatus(sb *ipnstate.StatusBuilder) {
|
|
st, err := e.getStatus()
|
|
if err != nil {
|
|
e.logf("wgengine: getStatus: %v", err)
|
|
return
|
|
}
|
|
for _, ps := range st.Peers {
|
|
sb.AddPeer(key.Public(ps.NodeKey), &ipnstate.PeerStatus{
|
|
RxBytes: int64(ps.RxBytes),
|
|
TxBytes: int64(ps.TxBytes),
|
|
LastHandshake: ps.LastHandshake,
|
|
InEngine: true,
|
|
})
|
|
}
|
|
|
|
e.magicConn.UpdateStatus(sb)
|
|
}
|
|
|
|
func (e *userspaceEngine) Ping(ip netaddr.IP, useTSMP bool, cb func(*ipnstate.PingResult)) {
|
|
res := &ipnstate.PingResult{IP: ip.String()}
|
|
peer, self, err := e.peerForIP(ip)
|
|
if err != nil {
|
|
e.logf("ping(%v): %v", ip, err)
|
|
res.Err = err.Error()
|
|
cb(res)
|
|
return
|
|
}
|
|
if peer == nil {
|
|
e.logf("ping(%v): no matching peer", ip)
|
|
res.Err = "no matching peer"
|
|
cb(res)
|
|
return
|
|
}
|
|
if self {
|
|
res.Err = fmt.Sprintf("%v is local Tailscale IP", ip)
|
|
res.IsLocalIP = true
|
|
cb(res)
|
|
return
|
|
}
|
|
|
|
pingType := "disco"
|
|
if useTSMP {
|
|
pingType = "TSMP"
|
|
}
|
|
e.logf("ping(%v): sending %v ping to %v %v ...", ip, pingType, peer.Key.ShortString(), peer.ComputedName)
|
|
if useTSMP {
|
|
e.sendTSMPPing(ip, peer, res, cb)
|
|
} else {
|
|
e.magicConn.Ping(peer, res, cb)
|
|
}
|
|
}
|
|
|
|
func (e *userspaceEngine) mySelfIPMatchingFamily(dst netaddr.IP) (src netaddr.IP, err error) {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
if e.netMap == nil {
|
|
return netaddr.IP{}, errors.New("no netmap")
|
|
}
|
|
for _, a := range e.netMap.Addresses {
|
|
if a.IsSingleIP() && a.IP().BitLen() == dst.BitLen() {
|
|
return a.IP(), nil
|
|
}
|
|
}
|
|
if len(e.netMap.Addresses) == 0 {
|
|
return netaddr.IP{}, errors.New("no self address in netmap")
|
|
}
|
|
return netaddr.IP{}, errors.New("no self address in netmap matching address family")
|
|
}
|
|
|
|
func (e *userspaceEngine) sendTSMPPing(ip netaddr.IP, peer *tailcfg.Node, res *ipnstate.PingResult, cb func(*ipnstate.PingResult)) {
|
|
srcIP, err := e.mySelfIPMatchingFamily(ip)
|
|
if err != nil {
|
|
res.Err = err.Error()
|
|
cb(res)
|
|
return
|
|
}
|
|
var iph packet.Header
|
|
if srcIP.Is4() {
|
|
iph = packet.IP4Header{
|
|
IPProto: ipproto.TSMP,
|
|
Src: srcIP,
|
|
Dst: ip,
|
|
}
|
|
} else {
|
|
iph = packet.IP6Header{
|
|
IPProto: ipproto.TSMP,
|
|
Src: srcIP,
|
|
Dst: ip,
|
|
}
|
|
}
|
|
|
|
var data [8]byte
|
|
crand.Read(data[:])
|
|
|
|
expireTimer := time.AfterFunc(10*time.Second, func() {
|
|
e.setTSMPPongCallback(data, nil)
|
|
})
|
|
t0 := time.Now()
|
|
e.setTSMPPongCallback(data, func(pong packet.TSMPPongReply) {
|
|
expireTimer.Stop()
|
|
d := time.Since(t0)
|
|
res.LatencySeconds = d.Seconds()
|
|
res.NodeIP = ip.String()
|
|
res.NodeName = peer.ComputedName
|
|
res.PeerAPIPort = pong.PeerAPIPort
|
|
cb(res)
|
|
})
|
|
|
|
var tsmpPayload [9]byte
|
|
tsmpPayload[0] = byte(packet.TSMPTypePing)
|
|
copy(tsmpPayload[1:], data[:])
|
|
|
|
tsmpPing := packet.Generate(iph, tsmpPayload[:])
|
|
e.tundev.InjectOutbound(tsmpPing)
|
|
}
|
|
|
|
func (e *userspaceEngine) setTSMPPongCallback(data [8]byte, cb func(packet.TSMPPongReply)) {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
if e.pongCallback == nil {
|
|
e.pongCallback = map[[8]byte]func(packet.TSMPPongReply){}
|
|
}
|
|
if cb == nil {
|
|
delete(e.pongCallback, data)
|
|
} else {
|
|
e.pongCallback[data] = cb
|
|
}
|
|
}
|
|
|
|
func (e *userspaceEngine) RegisterIPPortIdentity(ipport netaddr.IPPort, tsIP netaddr.IP) {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
if e.tsIPByIPPort == nil {
|
|
e.tsIPByIPPort = make(map[netaddr.IPPort]netaddr.IP)
|
|
}
|
|
e.tsIPByIPPort[ipport] = tsIP
|
|
}
|
|
|
|
func (e *userspaceEngine) UnregisterIPPortIdentity(ipport netaddr.IPPort) {
|
|
e.mu.Lock()
|
|
defer e.mu.Unlock()
|
|
if e.tsIPByIPPort == nil {
|
|
return
|
|
}
|
|
delete(e.tsIPByIPPort, ipport)
|
|
}
|
|
|
|
var whoIsSleeps = [...]time.Duration{
|
|
0,
|
|
10 * time.Millisecond,
|
|
20 * time.Millisecond,
|
|
50 * time.Millisecond,
|
|
100 * time.Millisecond,
|
|
}
|
|
|
|
func (e *userspaceEngine) WhoIsIPPort(ipport netaddr.IPPort) (tsIP netaddr.IP, ok bool) {
|
|
// We currently have a registration race,
|
|
// https://github.com/tailscale/tailscale/issues/1616,
|
|
// so loop a few times for now waiting for the registration
|
|
// to appear.
|
|
// TODO(bradfitz,namansood): remove this once #1616 is fixed.
|
|
for _, d := range whoIsSleeps {
|
|
time.Sleep(d)
|
|
e.mu.Lock()
|
|
tsIP, ok = e.tsIPByIPPort[ipport]
|
|
e.mu.Unlock()
|
|
if ok {
|
|
return tsIP, true
|
|
}
|
|
}
|
|
return tsIP, false
|
|
}
|
|
|
|
// peerForIP returns the Node in the wireguard config
|
|
// that's responsible for handling the given IP address.
|
|
//
|
|
// If none is found in the wireguard config but one is found in
|
|
// the netmap, it's described in an error.
|
|
//
|
|
// If none is found in either place, (nil, nil) is returned.
|
|
//
|
|
// peerForIP acquires both e.mu and e.wgLock, but neither at the same
|
|
// time.
|
|
func (e *userspaceEngine) peerForIP(ip netaddr.IP) (n *tailcfg.Node, isSelf bool, err error) {
|
|
e.mu.Lock()
|
|
nm := e.netMap
|
|
e.mu.Unlock()
|
|
if nm == nil {
|
|
return nil, false, errors.New("no network map")
|
|
}
|
|
|
|
// Check for exact matches before looking for subnet matches.
|
|
var bestInNMPrefix netaddr.IPPrefix
|
|
var bestInNM *tailcfg.Node
|
|
for _, p := range nm.Peers {
|
|
for _, a := range p.Addresses {
|
|
if a.IP() == ip && a.IsSingleIP() && tsaddr.IsTailscaleIP(ip) {
|
|
return p, false, nil
|
|
}
|
|
}
|
|
for _, cidr := range p.AllowedIPs {
|
|
if !cidr.Contains(ip) {
|
|
continue
|
|
}
|
|
if bestInNMPrefix.IsZero() || cidr.Bits() > bestInNMPrefix.Bits() {
|
|
bestInNMPrefix = cidr
|
|
bestInNM = p
|
|
}
|
|
}
|
|
}
|
|
for _, a := range nm.Addresses {
|
|
if a.IP() == ip && a.IsSingleIP() && tsaddr.IsTailscaleIP(ip) {
|
|
return nm.SelfNode, true, nil
|
|
}
|
|
}
|
|
|
|
e.wgLock.Lock()
|
|
defer e.wgLock.Unlock()
|
|
|
|
// TODO(bradfitz): this is O(n peers). Add ART to netaddr?
|
|
var best netaddr.IPPrefix
|
|
var bestKey tailcfg.NodeKey
|
|
for _, p := range e.lastCfgFull.Peers {
|
|
for _, cidr := range p.AllowedIPs {
|
|
if !cidr.Contains(ip) {
|
|
continue
|
|
}
|
|
if best.IsZero() || cidr.Bits() > best.Bits() {
|
|
best = cidr
|
|
bestKey = tailcfg.NodeKey(p.PublicKey)
|
|
}
|
|
}
|
|
}
|
|
// And another pass. Probably better than allocating a map per peerForIP
|
|
// call. But TODO(bradfitz): add a lookup map to netmap.NetworkMap.
|
|
if !bestKey.IsZero() {
|
|
for _, p := range nm.Peers {
|
|
if p.Key == bestKey {
|
|
return p, false, nil
|
|
}
|
|
}
|
|
}
|
|
if bestInNM == nil {
|
|
return nil, false, nil
|
|
}
|
|
if bestInNMPrefix.Bits() == 0 {
|
|
return nil, false, errors.New("exit node found but not enabled")
|
|
}
|
|
return nil, false, fmt.Errorf("node %q found, but not using its %v route", bestInNM.ComputedNameWithHost, bestInNMPrefix)
|
|
}
|
|
|
|
type closeOnErrorPool []func()
|
|
|
|
func (p *closeOnErrorPool) add(c io.Closer) { *p = append(*p, func() { c.Close() }) }
|
|
func (p *closeOnErrorPool) addFunc(fn func()) { *p = append(*p, fn) }
|
|
func (p closeOnErrorPool) closeAllIfError(errp *error) {
|
|
if *errp != nil {
|
|
for _, closeFn := range p {
|
|
closeFn()
|
|
}
|
|
}
|
|
}
|
|
|
|
// ipInPrefixes reports whether ip is in any of pp.
|
|
func ipInPrefixes(ip netaddr.IP, pp []netaddr.IPPrefix) bool {
|
|
for _, p := range pp {
|
|
if p.Contains(ip) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// dnsIPsOverTailscale returns the IPPrefixes of DNS resolver IPs that are
|
|
// routed over Tailscale. The returned value does not contain duplicates is
|
|
// not necessarily sorted.
|
|
func dnsIPsOverTailscale(dnsCfg *dns.Config, routerCfg *router.Config) (ret []netaddr.IPPrefix) {
|
|
m := map[netaddr.IP]bool{}
|
|
|
|
add := func(resolvers []dnstype.Resolver) {
|
|
for _, r := range resolvers {
|
|
ip, err := netaddr.ParseIP(r.Addr)
|
|
if err != nil {
|
|
if ipp, err := netaddr.ParseIPPort(r.Addr); err == nil {
|
|
ip = ipp.IP()
|
|
} else {
|
|
continue
|
|
}
|
|
}
|
|
if ipInPrefixes(ip, routerCfg.Routes) && !ipInPrefixes(ip, routerCfg.LocalRoutes) {
|
|
m[ip] = true
|
|
}
|
|
}
|
|
}
|
|
|
|
add(dnsCfg.DefaultResolvers)
|
|
for _, resolvers := range dnsCfg.Routes {
|
|
add(resolvers)
|
|
}
|
|
|
|
ret = make([]netaddr.IPPrefix, 0, len(m))
|
|
for ip := range m {
|
|
ret = append(ret, netaddr.IPPrefixFrom(ip, ip.BitLen()))
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// fwdDNSLinkSelector is userspaceEngine's resolver.ForwardLinkSelector, to pick
|
|
// which network interface to send DNS queries out of.
|
|
type fwdDNSLinkSelector struct {
|
|
ue *userspaceEngine
|
|
tunName string
|
|
}
|
|
|
|
func (ls fwdDNSLinkSelector) PickLink(ip netaddr.IP) (linkName string) {
|
|
if ls.ue.isDNSIPOverTailscale.Load().(func(netaddr.IP) bool)(ip) {
|
|
return ls.tunName
|
|
}
|
|
return ""
|
|
}
|