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Split up MapResponse

Browse source 
This commits extends the mapper with functions for creating "delta"
MapResponses for different purposes (peer changed, peer removed, derp).

This wires up the new state management with a new StateUpdate struct
letting the poll worker know what kind of update to send to the
connected nodes.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
This commit is contained in:
Kristoffer Dalby 2023-06-29 11:20:22 +01:00 committed by Kristoffer Dalby
parent 66ff1fcd40
commit 4b65cf48d0
8 changed files with 284 additions and 115 deletions
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9
hscontrol/app.go
View file

@ -257,7 +257,10 @@ func (h *Headscale) scheduledDERPMapUpdateWorker(cancelChan <-chan struct{}) {
h.DERPMap.Regions[region.RegionID] = &region
}
h.nodeNotifier.NotifyAll()
h.nodeNotifier.NotifyAll(types.StateUpdate{
Type: types.StateDERPUpdated,
DERPMap: *h.DERPMap,
})
}
}
}
@ -721,7 +724,9 @@ func (h *Headscale) Serve() error {
Str("path", aclPath).
Msg("ACL policy successfully reloaded, notifying nodes of change")
h.nodeNotifier.NotifyAll()
h.nodeNotifier.NotifyAll(types.StateUpdate{
Type: types.StateFullUpdate,
})
}
default:

70
hscontrol/db/machine.go
View file

@ -13,6 +13,7 @@ import (
"github.com/patrickmn/go-cache"
"github.com/rs/zerolog/log"
"gorm.io/gorm"
"tailscale.com/tailcfg"
"tailscale.com/types/key"
)
@ -218,7 +219,10 @@ func (hsdb *HSDatabase) SetTags(
}
machine.ForcedTags = newTags
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
hsdb.notifier.NotifyWithIgnore(types.StateUpdate{
Type: types.StatePeerChanged,
Changed: []uint64{machine.ID},
}, machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf("failed to update tags for machine in the database: %w", err)
@ -232,7 +236,10 @@ func (hsdb *HSDatabase) ExpireMachine(machine *types.Machine) error {
now := time.Now()
machine.Expiry = &now
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
hsdb.notifier.NotifyWithIgnore(types.StateUpdate{
Type: types.StatePeerChanged,
Changed: []uint64{machine.ID},
}, machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf("failed to expire machine in the database: %w", err)
@ -259,7 +266,10 @@ func (hsdb *HSDatabase) RenameMachine(machine *types.Machine, newName string) er
}
machine.GivenName = newName
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
hsdb.notifier.NotifyWithIgnore(types.StateUpdate{
Type: types.StatePeerChanged,
Changed: []uint64{machine.ID},
}, machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf("failed to rename machine in the database: %w", err)
@ -275,7 +285,10 @@ func (hsdb *HSDatabase) RefreshMachine(machine *types.Machine, expiry time.Time)
machine.LastSuccessfulUpdate = &now
machine.Expiry = &expiry
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
hsdb.notifier.NotifyWithIgnore(types.StateUpdate{
Type: types.StatePeerChanged,
Changed: []uint64{machine.ID},
}, machine.MachineKey)
if err := hsdb.db.Save(machine).Error; err != nil {
return fmt.Errorf(
@ -549,6 +562,27 @@ func (hsdb *HSDatabase) IsRoutesEnabled(machine *types.Machine, routeStr string)
return false
}
func OnlineMachineMap(peers types.Machines) map[tailcfg.NodeID]bool {
ret := make(map[tailcfg.NodeID]bool)
for _, peer := range peers {
ret[tailcfg.NodeID(peer.ID)] = peer.IsOnline()
}
return ret
}
func (hsdb *HSDatabase) ListOnlineMachines(
machine *types.Machine,
) (map[tailcfg.NodeID]bool, error) {
peers, err := hsdb.ListPeers(machine)
if err != nil {
return nil, err
}
return OnlineMachineMap(peers), nil
}
// enableRoutes enables new routes based on a list of new routes.
func (hsdb *HSDatabase) enableRoutes(machine *types.Machine, routeStrs ...string) error {
newRoutes := make([]netip.Prefix, len(routeStrs))
@ -600,7 +634,10 @@ func (hsdb *HSDatabase) enableRoutes(machine *types.Machine, routeStrs ...string
}
}
hsdb.notifier.NotifyWithIgnore(machine.MachineKey)
hsdb.notifier.NotifyWithIgnore(types.StateUpdate{
Type: types.StatePeerChanged,
Changed: []uint64{machine.ID},
}, machine.MachineKey)
return nil
}
@ -676,12 +713,13 @@ func (hsdb *HSDatabase) ExpireEphemeralMachines(inactivityThreshhold time.Durati
return
}
expiredFound := false
expired := make([]tailcfg.NodeID, 0)
for idx, machine := range machines {
if machine.IsEphemeral() && machine.LastSeen != nil &&
time.Now().
After(machine.LastSeen.Add(inactivityThreshhold)) {
expiredFound = true
expired = append(expired, tailcfg.NodeID(machine.ID))
log.Info().
Str("machine", machine.Hostname).
Msg("Ephemeral client removed from database")
@ -696,8 +734,11 @@ func (hsdb *HSDatabase) ExpireEphemeralMachines(inactivityThreshhold time.Durati
}
}
if expiredFound {
hsdb.notifier.NotifyAll()
if len(expired) > 0 {
hsdb.notifier.NotifyAll(types.StateUpdate{
Type: types.StatePeerRemoved,
Removed: expired,
})
}
}
}
@ -726,11 +767,11 @@ func (hsdb *HSDatabase) ExpireExpiredMachines(lastCheck time.Time) time.Time {
return time.Unix(0, 0)
}
expiredFound := false
expired := make([]tailcfg.NodeID, 0)
for index, machine := range machines {
if machine.IsExpired() &&
machine.Expiry.After(lastCheck) {
expiredFound = true
expired = append(expired, tailcfg.NodeID(machine.ID))
err := hsdb.ExpireMachine(&machines[index])
if err != nil {
@ -748,8 +789,11 @@ func (hsdb *HSDatabase) ExpireExpiredMachines(lastCheck time.Time) time.Time {
}
}
if expiredFound {
hsdb.notifier.NotifyAll()
if len(expired) > 0 {
hsdb.notifier.NotifyAll(types.StateUpdate{
Type: types.StatePeerRemoved,
Removed: expired,
})
}
}

13
hscontrol/db/routes.go
View file

@ -274,7 +274,7 @@ func (hsdb *HSDatabase) HandlePrimarySubnetFailover() error {
log.Error().Err(err).Msg("error getting routes")
}
routesChanged := false
changedMachines := make([]uint64, 0)
for pos, route := range routes {
if route.IsExitRoute() {
continue
@ -295,7 +295,7 @@ func (hsdb *HSDatabase) HandlePrimarySubnetFailover() error {
return err
}
routesChanged = true
changedMachines = append(changedMachines, route.MachineID)
continue
}
@ -369,12 +369,15 @@ func (hsdb *HSDatabase) HandlePrimarySubnetFailover() error {
return err
}
routesChanged = true
changedMachines = append(changedMachines, route.MachineID)
}
}
if routesChanged {
hsdb.notifier.NotifyAll()
if len(changedMachines) > 0 {
hsdb.notifier.NotifyAll(types.StateUpdate{
Type: types.StatePeerChanged,
Changed: changedMachines,
})
}
return nil

227
hscontrol/mapper/mapper.go
View file

@ -5,6 +5,7 @@ import (
"encoding/json"
"fmt"
"net/url"
"sort"
"strings"
"sync"
"time"
@ -129,45 +130,35 @@ func fullMapResponse(
return nil, err
}
// Peers is always returned sorted by Node.ID.
sort.SliceStable(tailPeers, func(x, y int) bool {
return tailPeers[x].ID < tailPeers[y].ID
})
now := time.Now()
resp := tailcfg.MapResponse{
KeepAlive: false,
Node: tailnode,
// TODO: Only send if updated
DERPMap: derpMap,
// TODO: Only send if updated
Node: tailnode,
Peers: tailPeers,
// TODO(kradalby): Implement:
// https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L1351-L1374
// PeersChanged
// PeersRemoved
// PeersChangedPatch
// PeerSeenChange
// OnlineChange
DERPMap: derpMap,
// TODO: Only send if updated
DNSConfig: dnsConfig,
Domain: baseDomain,
// TODO: Only send if updated
Domain: baseDomain,
// Do not instruct clients to collect services, we do not
// Do not instruct clients to collect services we do not
// support or do anything with them
CollectServices: "false",
// TODO: Only send if updated
PacketFilter: policy.ReduceFilterRules(machine, rules),
UserProfiles: profiles,
// TODO: Only send if updated
SSHPolicy: sshPolicy,
ControlTime: &now,
ControlTime: &now,
KeepAlive: false,
OnlineChange: db.OnlineMachineMap(peers),
Debug: &tailcfg.Debug{
DisableLogTail: !logtail,
@ -271,8 +262,8 @@ func addNextDNSMetadata(resolvers []*dnstype.Resolver, machine types.Machine) {
}
}
// CreateMapResponse returns a MapResponse for the given machine.
func (m Mapper) CreateMapResponse(
// FullMapResponse returns a MapResponse for the given machine.
func (m Mapper) FullMapResponse(
mapRequest tailcfg.MapRequest,
machine *types.Machine,
pol *policy.ACLPolicy,
@ -302,39 +293,107 @@ func (m Mapper) CreateMapResponse(
}
if m.isNoise {
return m.marshalMapResponse(mapResponse, key.MachinePublic{}, mapRequest.Compress)
return m.marshalMapResponse(mapResponse, machine, mapRequest.Compress)
}
var machineKey key.MachinePublic
err = machineKey.UnmarshalText([]byte(util.MachinePublicKeyEnsurePrefix(machine.MachineKey)))
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Cannot parse client key")
return nil, err
}
return m.marshalMapResponse(mapResponse, machineKey, mapRequest.Compress)
return m.marshalMapResponse(mapResponse, machine, mapRequest.Compress)
}
func (m Mapper) CreateKeepAliveResponse(
func (m Mapper) KeepAliveResponse(
mapRequest tailcfg.MapRequest,
machine *types.Machine,
) ([]byte, error) {
keepAliveResponse := tailcfg.MapResponse{
KeepAlive: true,
resp := m.baseMapResponse(machine)
resp.KeepAlive = true
return m.marshalMapResponse(&resp, machine, mapRequest.Compress)
}
func (m Mapper) DERPMapResponse(
mapRequest tailcfg.MapRequest,
machine *types.Machine,
derpMap tailcfg.DERPMap,
) ([]byte, error) {
resp := m.baseMapResponse(machine)
resp.DERPMap = &derpMap
return m.marshalMapResponse(&resp, machine, mapRequest.Compress)
}
func (m Mapper) PeerChangedResponse(
mapRequest tailcfg.MapRequest,
machine *types.Machine,
machineKeys []uint64,
pol *policy.ACLPolicy,
) ([]byte, error) {
var err error
changed := make(types.Machines, len(machineKeys))
lastSeen := make(map[tailcfg.NodeID]bool)
for idx, machineKey := range machineKeys {
peer, err := m.db.GetMachineByID(machineKey)
if err != nil {
return nil, err
}
changed[idx] = *peer
// We have just seen the node, let the peers update their list.
lastSeen[tailcfg.NodeID(peer.ID)] = true
}
if m.isNoise {
return m.marshalMapResponse(
keepAliveResponse,
key.MachinePublic{},
mapRequest.Compress,
)
rules, _, err := policy.GenerateFilterAndSSHRules(
pol,
machine,
changed,
)
if err != nil {
return nil, err
}
// Filter out peers that have expired.
changed = lo.Filter(changed, func(item types.Machine, index int) bool {
return !item.IsExpired()
})
// If there are filter rules present, see if there are any machines that cannot
// access eachother at all and remove them from the changed.
if len(rules) > 0 {
changed = policy.FilterMachinesByACL(machine, changed, rules)
}
tailPeers, err := tailNodes(changed, pol, m.dnsCfg, m.baseDomain)
if err != nil {
return nil, err
}
// Peers is always returned sorted by Node.ID.
sort.SliceStable(tailPeers, func(x, y int) bool {
return tailPeers[x].ID < tailPeers[y].ID
})
resp := m.baseMapResponse(machine)
resp.PeersChanged = tailPeers
resp.PeerSeenChange = lastSeen
return m.marshalMapResponse(&resp, machine, mapRequest.Compress)
}
func (m Mapper) PeerRemovedResponse(
mapRequest tailcfg.MapRequest,
machine *types.Machine,
removed []tailcfg.NodeID,
) ([]byte, error) {
resp := m.baseMapResponse(machine)
resp.PeersRemoved = removed
return m.marshalMapResponse(&resp, machine, mapRequest.Compress)
}
func (m Mapper) marshalMapResponse(
resp *tailcfg.MapResponse,
machine *types.Machine,
compression string,
) ([]byte, error) {
var machineKey key.MachinePublic
err := machineKey.UnmarshalText([]byte(util.MachinePublicKeyEnsurePrefix(machine.MachineKey)))
if err != nil {
@ -346,40 +405,6 @@ func (m Mapper) CreateKeepAliveResponse(
return nil, err
}
return m.marshalMapResponse(keepAliveResponse, machineKey, mapRequest.Compress)
}
// MarshalResponse takes an Tailscale Response, marhsal it to JSON.
// If isNoise is set, then the JSON body will be returned
// If !isNoise and privateKey2019 is set, the JSON body will be sealed in a Nacl box.
func MarshalResponse(
resp interface{},
isNoise bool,
privateKey2019 *key.MachinePrivate,
machineKey key.MachinePublic,
) ([]byte, error) {
jsonBody, err := json.Marshal(resp)
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Cannot marshal response")
return nil, err
}
if !isNoise && privateKey2019 != nil {
return privateKey2019.SealTo(machineKey, jsonBody), nil
}
return jsonBody, nil
}
func (m Mapper) marshalMapResponse(
resp interface{},
machineKey key.MachinePublic,
compression string,
) ([]byte, error) {
jsonBody, err := json.Marshal(resp)
if err != nil {
log.Error().
@ -409,6 +434,32 @@ func (m Mapper) marshalMapResponse(
return data, nil
}
// MarshalResponse takes an Tailscale Response, marhsal it to JSON.
// If isNoise is set, then the JSON body will be returned
// If !isNoise and privateKey2019 is set, the JSON body will be sealed in a Nacl box.
func MarshalResponse(
resp interface{},
isNoise bool,
privateKey2019 *key.MachinePrivate,
machineKey key.MachinePublic,
) ([]byte, error) {
jsonBody, err := json.Marshal(resp)
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Cannot marshal response")
return nil, err
}
if !isNoise && privateKey2019 != nil {
return privateKey2019.SealTo(machineKey, jsonBody), nil
}
return jsonBody, nil
}
func zstdEncode(in []byte) []byte {
encoder, ok := zstdEncoderPool.Get().(*zstd.Encoder)
if !ok {
@ -433,3 +484,19 @@ var zstdEncoderPool = &sync.Pool{
return encoder
},
}
func (m *Mapper) baseMapResponse(machine *types.Machine) tailcfg.MapResponse {
now := time.Now()
resp := tailcfg.MapResponse{
KeepAlive: false,
ControlTime: &now,
}
online, err := m.db.ListOnlineMachines(machine)
if err == nil {
resp.OnlineChange = online
}
return resp
}

2
hscontrol/mapper/mapper_test.go
View file

@ -387,6 +387,7 @@ func Test_fullMapResponse(t *testing.T) {
DNSConfig: &tailcfg.DNSConfig{},
Domain: "",
CollectServices: "false",
OnlineChange: map[tailcfg.NodeID]bool{tailPeer1.ID: false},
PacketFilter: []tailcfg.FilterRule{},
UserProfiles: []tailcfg.UserProfile{{LoginName: "mini", DisplayName: "mini"}},
SSHPolicy: &tailcfg.SSHPolicy{Rules: []*tailcfg.SSHRule{}},
@ -428,6 +429,7 @@ func Test_fullMapResponse(t *testing.T) {
DNSConfig: &tailcfg.DNSConfig{},
Domain: "",
CollectServices: "false",
OnlineChange: map[tailcfg.NodeID]bool{tailPeer1.ID: false},
PacketFilter: []tailcfg.FilterRule{
{
SrcIPs: []string{"100.64.0.2/32"},

15
hscontrol/notifier/notifier.go
View file

@ -3,24 +3,25 @@ package notifier
import (
"sync"
"github.com/juanfont/headscale/hscontrol/types"
"github.com/juanfont/headscale/hscontrol/util"
)
type Notifier struct {
l sync.RWMutex
nodes map[string]chan<- struct{}
nodes map[string]chan<- types.StateUpdate
}
func NewNotifier() *Notifier {
return &Notifier{}
}
func (n *Notifier) AddNode(machineKey string, c chan<- struct{}) {
func (n *Notifier) AddNode(machineKey string, c chan<- types.StateUpdate) {
n.l.Lock()
defer n.l.Unlock()
if n.nodes == nil {
n.nodes = make(map[string]chan<- struct{})
n.nodes = make(map[string]chan<- types.StateUpdate)
}
n.nodes[machineKey] = c
@ -37,11 +38,11 @@ func (n *Notifier) RemoveNode(machineKey string) {
delete(n.nodes, machineKey)
}
func (n *Notifier) NotifyAll() {
n.NotifyWithIgnore()
func (n *Notifier) NotifyAll(update types.StateUpdate) {
n.NotifyWithIgnore(update)
}
func (n *Notifier) NotifyWithIgnore(ignore ...string) {
func (n *Notifier) NotifyWithIgnore(update types.StateUpdate, ignore ...string) {
n.l.RLock()
defer n.l.RUnlock()
@ -50,6 +51,6 @@ func (n *Notifier) NotifyWithIgnore(ignore ...string) {
continue
}
c <- struct{}{}
c <- update
}
}

34
hscontrol/poll.go
View file

@ -116,7 +116,7 @@ func (h *Headscale) handlePoll(
return
}
mapResp, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
mapResp, err := mapp.FullMapResponse(mapRequest, machine, h.ACLPolicy)
if err != nil {
logErr(err, "Failed to create MapResponse")
http.Error(writer, "", http.StatusInternalServerError)
@ -163,7 +163,12 @@ func (h *Headscale) handlePoll(
Inc()
// Tell all the other nodes about the new endpoint, but dont update ourselves.
h.nodeNotifier.NotifyWithIgnore(machine.MachineKey)
h.nodeNotifier.NotifyWithIgnore(
types.StateUpdate{
Type: types.StatePeerChanged,
Changed: []uint64{machine.ID},
},
machine.MachineKey)
return
} else if mapRequest.OmitPeers && mapRequest.Stream {
@ -220,7 +225,7 @@ func (h *Headscale) pollNetMapStream(
keepAliveTicker := time.NewTicker(keepAliveInterval)
const chanSize = 8
updateChan := make(chan struct{}, chanSize)
updateChan := make(chan types.StateUpdate, chanSize)
h.pollNetMapStreamWG.Add(1)
defer h.pollNetMapStreamWG.Done()
@ -238,7 +243,7 @@ func (h *Headscale) pollNetMapStream(
for {
select {
case <-keepAliveTicker.C:
data, err := mapp.CreateKeepAliveResponse(mapRequest, machine)
data, err := mapp.KeepAliveResponse(mapRequest, machine)
if err != nil {
logErr(err, "Error generating the keep alive msg")
@ -263,10 +268,23 @@ func (h *Headscale) pollNetMapStream(
return
}
case <-updateChan:
data, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
case update := <-updateChan:
var data []byte
var err error
switch update.Type {
case types.StateFullUpdate:
data, err = mapp.FullMapResponse(mapRequest, machine, h.ACLPolicy)
case types.StatePeerChanged:
data, err = mapp.PeerChangedResponse(mapRequest, machine, update.Changed, h.ACLPolicy)
case types.StatePeerRemoved:
data, err = mapp.PeerRemovedResponse(mapRequest, machine, update.Removed)
case types.StateDERPUpdated:
data, err = mapp.DERPMapResponse(mapRequest, machine, update.DERPMap)
}
if err != nil {
logErr(err, "Could not get the map update")
logErr(err, "Could not get the create map update")
return
}
@ -317,7 +335,7 @@ func (h *Headscale) pollNetMapStream(
}
}
func closeChanWithLog[C chan []byte | chan struct{}](channel C, machine, name string) {
func closeChanWithLog[C chan []byte | chan struct{} | chan types.StateUpdate](channel C, machine, name string) {
log.Trace().
Str("handler", "PollNetMap").
Str("machine", machine).

29
hscontrol/types/common.go
View file

@ -106,3 +106,32 @@ func (i StringList) Value() (driver.Value, error) {
return string(bytes), err
}
type StateUpdateType int
const (
StateFullUpdate StateUpdateType = iota
StatePeerChanged
StatePeerRemoved
StateDERPUpdated
)
// StateUpdate is an internal message containing information about
// a state change that has happened to the network.
type StateUpdate struct {
// The type of update
Type StateUpdateType
// Changed must be set when Type is StatePeerChanged and
// contain the Machine IDs of machines that has changed.
Changed []uint64
// Removed must be set when Type is StatePeerRemoved and
// contain a list of the nodes that has been removed from
// the network.
Removed []tailcfg.NodeID
// DERPMap must be set when Type is StateDERPUpdated and
// contain the new DERP Map.
DERPMap tailcfg.DERPMap
}