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tailscale/control/controlclient/map.go

825 lines
22 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package controlclient
import (
"context"
"encoding/json"
"fmt"
"net"
"net/netip"
"reflect"
"slices"
"sort"
"strconv"
"sync"
"time"
"tailscale.com/control/controlknobs"
"tailscale.com/envknob"
"tailscale.com/tailcfg"
"tailscale.com/tstime"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/netmap"
"tailscale.com/types/ptr"
"tailscale.com/types/views"
"tailscale.com/util/clientmetric"
"tailscale.com/util/cmpx"
"tailscale.com/wgengine/filter"
)
// mapSession holds the state over a long-polled "map" request to the
// control plane.
//
// It accepts incremental tailcfg.MapResponse values to
// netMapForResponse and returns fully inflated NetworkMaps, filling
// in the omitted data implicit from prior MapResponse values from
// within the same session (the same long-poll HTTP response to the
// one MapRequest).
type mapSession struct {
// Immutable fields.
netmapUpdater NetmapUpdater // called on changes (in addition to the optional hooks below)
controlKnobs *controlknobs.Knobs // or nil
privateNodeKey key.NodePrivate
publicNodeKey key.NodePublic
logf logger.Logf
vlogf logger.Logf
machinePubKey key.MachinePublic
altClock tstime.Clock // if nil, regular time is used
cancel context.CancelFunc // always non-nil, shuts down caller's base long poll context
watchdogReset chan struct{} // send to request that the long poll activity watchdog timeout be reset
// sessionAliveCtx is a Background-based context that's alive for the
// duration of the mapSession that we own the lifetime of. It's closed by
// sessionAliveCtxClose.
sessionAliveCtx context.Context
sessionAliveCtxClose context.CancelFunc // closes sessionAliveCtx
// Optional hooks, set once before use.
// onDebug specifies what to do with a *tailcfg.Debug message.
// If the watchdogReset chan is nil, it's not used. Otherwise it can be sent to
// to request that the long poll activity watchdog timeout be reset.
onDebug func(_ context.Context, _ *tailcfg.Debug, watchdogReset chan<- struct{}) error
// onConciseNetMapSummary, if non-nil, is called with the Netmap.VeryConcise summary
// whenever a map response is received.
onConciseNetMapSummary func(string)
// onSelfNodeChanged is called before the NetmapUpdater if the self node was
// changed.
onSelfNodeChanged func(*netmap.NetworkMap)
// Fields storing state over the course of multiple MapResponses.
lastNode tailcfg.NodeView
peers map[tailcfg.NodeID]*tailcfg.NodeView // pointer to view (oddly). same pointers as sortedPeers.
sortedPeers []*tailcfg.NodeView // same pointers as peers, but sorted by Node.ID
lastDNSConfig *tailcfg.DNSConfig
lastDERPMap *tailcfg.DERPMap
lastUserProfile map[tailcfg.UserID]tailcfg.UserProfile
lastPacketFilterRules views.Slice[tailcfg.FilterRule]
lastParsedPacketFilter []filter.Match
lastSSHPolicy *tailcfg.SSHPolicy
collectServices bool
lastDomain string
lastDomainAuditLogID string
lastHealth []string
lastPopBrowserURL string
stickyDebug tailcfg.Debug // accumulated opt.Bool values
lastTKAInfo *tailcfg.TKAInfo
lastNetmapSummary string // from NetworkMap.VeryConcise
}
// newMapSession returns a mostly unconfigured new mapSession.
//
// Modify its optional fields on the returned value before use.
//
// It must have its Close method called to release resources.
func newMapSession(privateNodeKey key.NodePrivate, nu NetmapUpdater, controlKnobs *controlknobs.Knobs) *mapSession {
ms := &mapSession{
netmapUpdater: nu,
controlKnobs: controlKnobs,
privateNodeKey: privateNodeKey,
publicNodeKey: privateNodeKey.Public(),
lastDNSConfig: new(tailcfg.DNSConfig),
lastUserProfile: map[tailcfg.UserID]tailcfg.UserProfile{},
watchdogReset: make(chan struct{}),
// Non-nil no-op defaults, to be optionally overridden by the caller.
logf: logger.Discard,
vlogf: logger.Discard,
cancel: func() {},
onDebug: func(context.Context, *tailcfg.Debug, chan<- struct{}) error { return nil },
onConciseNetMapSummary: func(string) {},
onSelfNodeChanged: func(*netmap.NetworkMap) {},
}
ms.sessionAliveCtx, ms.sessionAliveCtxClose = context.WithCancel(context.Background())
return ms
}
func (ms *mapSession) clock() tstime.Clock {
return cmpx.Or[tstime.Clock](ms.altClock, tstime.StdClock{})
}
// StartWatchdog starts the session's watchdog timer.
// If there's no activity in too long, it tears down the connection.
// Call Close to release these resources.
func (ms *mapSession) StartWatchdog() {
timer, timedOutChan := ms.clock().NewTimer(watchdogTimeout)
go func() {
defer timer.Stop()
for {
select {
case <-ms.sessionAliveCtx.Done():
ms.vlogf("netmap: ending timeout goroutine")
return
case <-timedOutChan:
ms.logf("map response long-poll timed out!")
ms.cancel()
return
case <-ms.watchdogReset:
if !timer.Stop() {
select {
case <-timedOutChan:
case <-ms.sessionAliveCtx.Done():
ms.vlogf("netmap: ending timeout goroutine")
return
}
}
ms.vlogf("netmap: reset timeout timer")
timer.Reset(watchdogTimeout)
}
}
}()
}
func (ms *mapSession) Close() {
ms.sessionAliveCtxClose()
}
// HandleNonKeepAliveMapResponse handles a non-KeepAlive MapResponse (full or
// incremental).
//
// All fields that are valid on a KeepAlive MapResponse have already been
// handled.
//
// TODO(bradfitz): make this handle all fields later. For now (2023-08-20) this
// is [re]factoring progress enough.
func (ms *mapSession) HandleNonKeepAliveMapResponse(ctx context.Context, resp *tailcfg.MapResponse) error {
if debug := resp.Debug; debug != nil {
if err := ms.onDebug(ctx, debug, ms.watchdogReset); err != nil {
return err
}
}
if DevKnob.StripEndpoints() {
for _, p := range resp.Peers {
p.Endpoints = nil
}
for _, p := range resp.PeersChanged {
p.Endpoints = nil
}
}
// For responses that mutate the self node, check for updated nodeAttrs.
if resp.Node != nil {
if DevKnob.StripCaps() {
resp.Node.Capabilities = nil
resp.Node.CapMap = nil
}
ms.controlKnobs.UpdateFromNodeAttributes(resp.Node.Capabilities, resp.Node.CapMap)
}
// Call Node.InitDisplayNames on any changed nodes.
initDisplayNames(cmpx.Or(resp.Node.View(), ms.lastNode), resp)
ms.patchifyPeersChanged(resp)
ms.updateStateFromResponse(resp)
if ms.tryHandleIncrementally(resp) {
ms.onConciseNetMapSummary(ms.lastNetmapSummary) // every 5s log
return nil
}
// We have to rebuild the whole netmap (lots of garbage & work downstream of
// our UpdateFullNetmap call). This is the part we tried to avoid but
// some field mutations (especially rare ones) aren't yet handled.
nm := ms.netmap()
ms.lastNetmapSummary = nm.VeryConcise()
ms.onConciseNetMapSummary(ms.lastNetmapSummary)
// If the self node changed, we might need to update persist.
if resp.Node != nil {
ms.onSelfNodeChanged(nm)
}
ms.netmapUpdater.UpdateFullNetmap(nm)
return nil
}
func (ms *mapSession) tryHandleIncrementally(res *tailcfg.MapResponse) bool {
if ms.controlKnobs != nil && ms.controlKnobs.DisableDeltaUpdates.Load() {
return false
}
nud, ok := ms.netmapUpdater.(NetmapDeltaUpdater)
if !ok {
return false
}
mutations, ok := netmap.MutationsFromMapResponse(res, time.Now())
if ok && len(mutations) > 0 {
return nud.UpdateNetmapDelta(mutations)
}
return ok
}
// updateStats are some stats from updateStateFromResponse, primarily for
// testing. It's meant to be cheap enough to always compute, though. It doesn't
// allocate.
type updateStats struct {
allNew bool
added int
removed int
changed int
}
// updateStateFromResponse updates ms from res. It takes ownership of res.
func (ms *mapSession) updateStateFromResponse(resp *tailcfg.MapResponse) {
ms.updatePeersStateFromResponse(resp)
if resp.Node != nil {
ms.lastNode = resp.Node.View()
}
for _, up := range resp.UserProfiles {
ms.lastUserProfile[up.ID] = up
}
// TODO(bradfitz): clean up old user profiles? maybe not worth it.
if dm := resp.DERPMap; dm != nil {
ms.vlogf("netmap: new map contains DERP map")
// Zero-valued fields in a DERPMap mean that we're not changing
// anything and are using the previous value(s).
if ldm := ms.lastDERPMap; ldm != nil {
if dm.Regions == nil {
dm.Regions = ldm.Regions
dm.OmitDefaultRegions = ldm.OmitDefaultRegions
}
if dm.HomeParams == nil {
dm.HomeParams = ldm.HomeParams
} else if oldhh := ldm.HomeParams; oldhh != nil {
// Propagate sub-fields of HomeParams
hh := dm.HomeParams
if hh.RegionScore == nil {
hh.RegionScore = oldhh.RegionScore
}
}
}
ms.lastDERPMap = dm
}
if pf := resp.PacketFilter; pf != nil {
var err error
ms.lastPacketFilterRules = views.SliceOf(pf)
ms.lastParsedPacketFilter, err = filter.MatchesFromFilterRules(pf)
if err != nil {
ms.logf("parsePacketFilter: %v", err)
}
}
if c := resp.DNSConfig; c != nil {
ms.lastDNSConfig = c
}
if p := resp.SSHPolicy; p != nil {
ms.lastSSHPolicy = p
}
if v, ok := resp.CollectServices.Get(); ok {
ms.collectServices = v
}
if resp.Domain != "" {
ms.lastDomain = resp.Domain
}
if resp.DomainDataPlaneAuditLogID != "" {
ms.lastDomainAuditLogID = resp.DomainDataPlaneAuditLogID
}
if resp.Health != nil {
ms.lastHealth = resp.Health
}
if resp.TKAInfo != nil {
ms.lastTKAInfo = resp.TKAInfo
}
}
var (
patchDERPRegion = clientmetric.NewCounter("controlclient_patch_derp")
patchEndpoints = clientmetric.NewCounter("controlclient_patch_endpoints")
patchCap = clientmetric.NewCounter("controlclient_patch_capver")
patchKey = clientmetric.NewCounter("controlclient_patch_key")
patchDiscoKey = clientmetric.NewCounter("controlclient_patch_discokey")
patchOnline = clientmetric.NewCounter("controlclient_patch_online")
patchLastSeen = clientmetric.NewCounter("controlclient_patch_lastseen")
patchKeyExpiry = clientmetric.NewCounter("controlclient_patch_keyexpiry")
patchCapabilities = clientmetric.NewCounter("controlclient_patch_capabilities")
patchCapMap = clientmetric.NewCounter("controlclient_patch_capmap")
patchKeySignature = clientmetric.NewCounter("controlclient_patch_keysig")
patchifiedPeer = clientmetric.NewCounter("controlclient_patchified_peer")
patchifiedPeerEqual = clientmetric.NewCounter("controlclient_patchified_peer_equal")
)
// updatePeersStateFromResponseres updates ms.peers and ms.sortedPeers from res. It takes ownership of res.
func (ms *mapSession) updatePeersStateFromResponse(resp *tailcfg.MapResponse) (stats updateStats) {
defer func() {
if stats.removed > 0 || stats.added > 0 {
ms.rebuildSorted()
}
}()
if ms.peers == nil {
ms.peers = make(map[tailcfg.NodeID]*tailcfg.NodeView)
}
if len(resp.Peers) > 0 {
// Not delta encoded.
stats.allNew = true
keep := make(map[tailcfg.NodeID]bool, len(resp.Peers))
for _, n := range resp.Peers {
keep[n.ID] = true
if vp, ok := ms.peers[n.ID]; ok {
stats.changed++
*vp = n.View()
} else {
stats.added++
ms.peers[n.ID] = ptr.To(n.View())
}
}
for id := range ms.peers {
if !keep[id] {
stats.removed++
delete(ms.peers, id)
}
}
// Peers precludes all other delta operations so just return.
return
}
for _, id := range resp.PeersRemoved {
if _, ok := ms.peers[id]; ok {
delete(ms.peers, id)
stats.removed++
}
}
for _, n := range resp.PeersChanged {
if vp, ok := ms.peers[n.ID]; ok {
stats.changed++
*vp = n.View()
} else {
stats.added++
ms.peers[n.ID] = ptr.To(n.View())
}
}
for nodeID, seen := range resp.PeerSeenChange {
if vp, ok := ms.peers[nodeID]; ok {
mut := vp.AsStruct()
if seen {
mut.LastSeen = ptr.To(clock.Now())
} else {
mut.LastSeen = nil
}
*vp = mut.View()
stats.changed++
}
}
for nodeID, online := range resp.OnlineChange {
if vp, ok := ms.peers[nodeID]; ok {
mut := vp.AsStruct()
mut.Online = ptr.To(online)
*vp = mut.View()
stats.changed++
}
}
for _, pc := range resp.PeersChangedPatch {
vp, ok := ms.peers[pc.NodeID]
if !ok {
continue
}
stats.changed++
mut := vp.AsStruct()
if pc.DERPRegion != 0 {
mut.DERP = fmt.Sprintf("%s:%v", tailcfg.DerpMagicIP, pc.DERPRegion)
patchDERPRegion.Add(1)
}
if pc.Cap != 0 {
mut.Cap = pc.Cap
patchCap.Add(1)
}
if pc.Endpoints != nil {
mut.Endpoints = pc.Endpoints
patchEndpoints.Add(1)
}
if pc.Key != nil {
mut.Key = *pc.Key
patchKey.Add(1)
}
if pc.DiscoKey != nil {
mut.DiscoKey = *pc.DiscoKey
patchDiscoKey.Add(1)
}
if v := pc.Online; v != nil {
mut.Online = ptr.To(*v)
patchOnline.Add(1)
}
if v := pc.LastSeen; v != nil {
mut.LastSeen = ptr.To(*v)
patchLastSeen.Add(1)
}
if v := pc.KeyExpiry; v != nil {
mut.KeyExpiry = *v
patchKeyExpiry.Add(1)
}
if v := pc.Capabilities; v != nil {
mut.Capabilities = *v
patchCapabilities.Add(1)
}
if v := pc.KeySignature; v != nil {
mut.KeySignature = v
patchKeySignature.Add(1)
}
if v := pc.CapMap; v != nil {
mut.CapMap = v
patchCapMap.Add(1)
}
*vp = mut.View()
}
return
}
// rebuildSorted rebuilds ms.sortedPeers from ms.peers. It should be called
// after any additions or removals from peers.
func (ms *mapSession) rebuildSorted() {
if ms.sortedPeers == nil {
ms.sortedPeers = make([]*tailcfg.NodeView, 0, len(ms.peers))
} else {
if len(ms.sortedPeers) > len(ms.peers) {
clear(ms.sortedPeers[len(ms.peers):])
}
ms.sortedPeers = ms.sortedPeers[:0]
}
for _, p := range ms.peers {
ms.sortedPeers = append(ms.sortedPeers, p)
}
sort.Slice(ms.sortedPeers, func(i, j int) bool {
return ms.sortedPeers[i].ID() < ms.sortedPeers[j].ID()
})
}
func (ms *mapSession) addUserProfile(nm *netmap.NetworkMap, userID tailcfg.UserID) {
if userID == 0 {
return
}
if _, dup := nm.UserProfiles[userID]; dup {
// Already populated it from a previous peer.
return
}
if up, ok := ms.lastUserProfile[userID]; ok {
nm.UserProfiles[userID] = up
}
}
var debugPatchifyPeer = envknob.RegisterBool("TS_DEBUG_PATCHIFY_PEER")
// patchifyPeersChanged mutates resp to promote PeersChanged entries to PeersChangedPatch
// when possible.
func (ms *mapSession) patchifyPeersChanged(resp *tailcfg.MapResponse) {
filtered := resp.PeersChanged[:0]
for _, n := range resp.PeersChanged {
if p, ok := ms.patchifyPeer(n); ok {
patchifiedPeer.Add(1)
if debugPatchifyPeer() {
patchj, _ := json.Marshal(p)
ms.logf("debug: patchifyPeer[ID=%v]: %s", n.ID, patchj)
}
if p != nil {
resp.PeersChangedPatch = append(resp.PeersChangedPatch, p)
} else {
patchifiedPeerEqual.Add(1)
}
} else {
filtered = append(filtered, n)
}
}
resp.PeersChanged = filtered
if len(resp.PeersChanged) == 0 {
resp.PeersChanged = nil
}
}
var nodeFields = sync.OnceValue(getNodeFields)
// getNodeFields returns the fails of tailcfg.Node.
func getNodeFields() []string {
rt := reflect.TypeOf((*tailcfg.Node)(nil)).Elem()
ret := make([]string, rt.NumField())
for i := 0; i < rt.NumField(); i++ {
ret[i] = rt.Field(i).Name
}
return ret
}
// patchifyPeer returns a *tailcfg.PeerChange of the session's existing copy of
// the n.ID Node to n.
//
// It returns ok=false if a patch can't be made, (V, ok) on a delta, or (nil,
// true) if all the fields were identical (a zero change).
func (ms *mapSession) patchifyPeer(n *tailcfg.Node) (_ *tailcfg.PeerChange, ok bool) {
was, ok := ms.peers[n.ID]
if !ok {
return nil, false
}
return peerChangeDiff(*was, n)
}
// peerChangeDiff returns the difference from 'was' to 'n', if possible.
//
// It returns (nil, true) if the fields were identical.
func peerChangeDiff(was tailcfg.NodeView, n *tailcfg.Node) (_ *tailcfg.PeerChange, ok bool) {
var ret *tailcfg.PeerChange
pc := func() *tailcfg.PeerChange {
if ret == nil {
ret = new(tailcfg.PeerChange)
}
return ret
}
for _, field := range nodeFields() {
switch field {
default:
// The whole point of using reflect in this function is to panic
// here in tests if we forget to handle a new field.
panic("unhandled field: " + field)
case "computedHostIfDifferent", "ComputedName", "ComputedNameWithHost":
// Caller's responsibility to have populated these.
continue
case "DataPlaneAuditLogID":
// Not sent for peers.
case "ID":
if was.ID() != n.ID {
return nil, false
}
case "StableID":
if was.StableID() != n.StableID {
return nil, false
}
case "Name":
if was.Name() != n.Name {
return nil, false
}
case "User":
if was.User() != n.User {
return nil, false
}
case "Sharer":
if was.Sharer() != n.Sharer {
return nil, false
}
case "Key":
if was.Key() != n.Key {
pc().Key = ptr.To(n.Key)
}
case "KeyExpiry":
if !was.KeyExpiry().Equal(n.KeyExpiry) {
pc().KeyExpiry = ptr.To(n.KeyExpiry)
}
case "KeySignature":
if !was.KeySignature().Equal(n.KeySignature) {
pc().KeySignature = slices.Clone(n.KeySignature)
}
case "Machine":
if was.Machine() != n.Machine {
return nil, false
}
case "DiscoKey":
if was.DiscoKey() != n.DiscoKey {
pc().DiscoKey = ptr.To(n.DiscoKey)
}
case "Addresses":
if !views.SliceEqual(was.Addresses(), views.SliceOf(n.Addresses)) {
return nil, false
}
case "AllowedIPs":
if !views.SliceEqual(was.AllowedIPs(), views.SliceOf(n.AllowedIPs)) {
return nil, false
}
case "Endpoints":
if !views.SliceEqual(was.Endpoints(), views.SliceOf(n.Endpoints)) {
pc().Endpoints = slices.Clone(n.Endpoints)
}
case "DERP":
if was.DERP() != n.DERP {
ip, portStr, err := net.SplitHostPort(n.DERP)
if err != nil || ip != "127.3.3.40" {
return nil, false
}
port, err := strconv.Atoi(portStr)
if err != nil || port < 1 || port > 65535 {
return nil, false
}
pc().DERPRegion = port
}
case "Hostinfo":
if !was.Hostinfo().Valid() && !n.Hostinfo.Valid() {
continue
}
if !was.Hostinfo().Valid() || !n.Hostinfo.Valid() {
return nil, false
}
if !was.Hostinfo().Equal(n.Hostinfo) {
return nil, false
}
case "Created":
if !was.Created().Equal(n.Created) {
return nil, false
}
case "Cap":
if was.Cap() != n.Cap {
pc().Cap = n.Cap
}
case "CapMap":
if n.CapMap != nil {
pc().CapMap = n.CapMap
}
case "Tags":
if !views.SliceEqual(was.Tags(), views.SliceOf(n.Tags)) {
return nil, false
}
case "PrimaryRoutes":
if !views.SliceEqual(was.PrimaryRoutes(), views.SliceOf(n.PrimaryRoutes)) {
return nil, false
}
case "Online":
wasOnline := was.Online()
if n.Online != nil && wasOnline != nil && *n.Online != *wasOnline {
pc().Online = ptr.To(*n.Online)
}
case "LastSeen":
wasSeen := was.LastSeen()
if n.LastSeen != nil && wasSeen != nil && !wasSeen.Equal(*n.LastSeen) {
pc().LastSeen = ptr.To(*n.LastSeen)
}
case "MachineAuthorized":
if was.MachineAuthorized() != n.MachineAuthorized {
return nil, false
}
case "Capabilities":
if !views.SliceEqual(was.Capabilities(), views.SliceOf(n.Capabilities)) {
pc().Capabilities = ptr.To(n.Capabilities)
}
case "UnsignedPeerAPIOnly":
if was.UnsignedPeerAPIOnly() != n.UnsignedPeerAPIOnly {
return nil, false
}
case "IsWireGuardOnly":
if was.IsWireGuardOnly() != n.IsWireGuardOnly {
return nil, false
}
case "Expired":
if was.Expired() != n.Expired {
return nil, false
}
case "SelfNodeV4MasqAddrForThisPeer":
va, vb := was.SelfNodeV4MasqAddrForThisPeer(), n.SelfNodeV4MasqAddrForThisPeer
if va == nil && vb == nil {
continue
}
if va == nil || vb == nil || *va != *vb {
return nil, false
}
case "SelfNodeV6MasqAddrForThisPeer":
va, vb := was.SelfNodeV6MasqAddrForThisPeer(), n.SelfNodeV6MasqAddrForThisPeer
if va == nil && vb == nil {
continue
}
if va == nil || vb == nil || *va != *vb {
return nil, false
}
case "ExitNodeDNSResolvers":
va, vb := was.ExitNodeDNSResolvers(), views.SliceOfViews(n.ExitNodeDNSResolvers)
if va.Len() != vb.Len() {
return nil, false
}
for i := range va.LenIter() {
if !va.At(i).Equal(vb.At(i)) {
return nil, false
}
}
}
}
if ret != nil {
ret.NodeID = n.ID
}
return ret, true
}
// netmap returns a fully populated NetworkMap from the last state seen from
// a call to updateStateFromResponse, filling in omitted
// information from prior MapResponse values.
func (ms *mapSession) netmap() *netmap.NetworkMap {
peerViews := make([]tailcfg.NodeView, len(ms.sortedPeers))
for i, vp := range ms.sortedPeers {
peerViews[i] = *vp
}
nm := &netmap.NetworkMap{
NodeKey: ms.publicNodeKey,
PrivateKey: ms.privateNodeKey,
MachineKey: ms.machinePubKey,
Peers: peerViews,
UserProfiles: make(map[tailcfg.UserID]tailcfg.UserProfile),
Domain: ms.lastDomain,
DomainAuditLogID: ms.lastDomainAuditLogID,
DNS: *ms.lastDNSConfig,
PacketFilter: ms.lastParsedPacketFilter,
PacketFilterRules: ms.lastPacketFilterRules,
SSHPolicy: ms.lastSSHPolicy,
CollectServices: ms.collectServices,
DERPMap: ms.lastDERPMap,
ControlHealth: ms.lastHealth,
TKAEnabled: ms.lastTKAInfo != nil && !ms.lastTKAInfo.Disabled,
}
if ms.lastTKAInfo != nil && ms.lastTKAInfo.Head != "" {
if err := nm.TKAHead.UnmarshalText([]byte(ms.lastTKAInfo.Head)); err != nil {
ms.logf("error unmarshalling TKAHead: %v", err)
nm.TKAEnabled = false
}
}
if node := ms.lastNode; node.Valid() {
nm.SelfNode = node
nm.Expiry = node.KeyExpiry()
nm.Name = node.Name()
}
ms.addUserProfile(nm, nm.User())
for _, peer := range peerViews {
ms.addUserProfile(nm, peer.Sharer())
ms.addUserProfile(nm, peer.User())
}
if DevKnob.ForceProxyDNS() {
nm.DNS.Proxied = true
}
return nm
}
func nodesSorted(v []*tailcfg.Node) bool {
for i, n := range v {
if i > 0 && n.ID <= v[i-1].ID {
return false
}
}
return true
}
func sortNodes(v []*tailcfg.Node) {
sort.Slice(v, func(i, j int) bool { return v[i].ID < v[j].ID })
}
func cloneNodes(v1 []*tailcfg.Node) []*tailcfg.Node {
if v1 == nil {
return nil
}
v2 := make([]*tailcfg.Node, len(v1))
for i, n := range v1 {
v2[i] = n.Clone()
}
return v2
}
var debugSelfIPv6Only = envknob.RegisterBool("TS_DEBUG_SELF_V6_ONLY")
func filterSelfAddresses(in []netip.Prefix) (ret []netip.Prefix) {
switch {
default:
return in
case debugSelfIPv6Only():
for _, a := range in {
if a.Addr().Is6() {
ret = append(ret, a)
}
}
return ret
}
}