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Simplify reconfiguration

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This commit is contained in:
Neil Alexander 2019-08-28 19:31:04 +01:00
parent 764f9c8e11
commit fc9a1c6c31
No known key found for this signature in database
GPG Key ID: A02A2019A2BB0944
13 changed files with 64 additions and 141 deletions
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1
cmd/yggdrasil/main.go
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@ -279,6 +279,7 @@ func main() {
case _ = <-r:
if *useconffile != "" {
cfg = readConfig(useconf, useconffile, normaliseconf)
logger.Infoln("Reloading configuration from", *useconffile)
n.core.UpdateConfig(cfg)
n.tuntap.UpdateConfig(cfg)
n.multicast.UpdateConfig(cfg)

1
src/multicast/multicast.go
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@ -83,7 +83,6 @@ func (m *Multicast) Stop() error {
func (m *Multicast) UpdateConfig(config *config.NodeConfig) {
m.log.Debugln("Reloading multicast configuration...")
m.config.Replace(*config)
m.log.Infoln("Multicast configuration reloaded successfully")
}
// GetInterfaces returns the currently known/enabled multicast interfaces. It is

66
src/tuntap/ckr.go
View File

@ -20,7 +20,6 @@ import (
type cryptokey struct {
tun *TunAdapter
enabled atomic.Value // bool
reconfigure chan chan error
ipv4remotes []cryptokey_route
ipv6remotes []cryptokey_route
ipv4cache map[address.Address]cryptokey_route
@ -40,24 +39,11 @@ type cryptokey_route struct {
// Initialise crypto-key routing. This must be done before any other CKR calls.
func (c *cryptokey) init(tun *TunAdapter) {
c.tun = tun
c.reconfigure = make(chan chan error, 1)
go func() {
for {
e := <-c.reconfigure
e <- nil
}
}()
c.tun.log.Debugln("Configuring CKR...")
if err := c.configure(); err != nil {
c.tun.log.Errorln("CKR configuration failed:", err)
} else {
c.tun.log.Debugln("CKR configured")
}
c.configure()
}
// Configure the CKR routes.
func (c *cryptokey) configure() error {
// Configure the CKR routes. This should only ever be ran by the TUN/TAP actor.
func (c *cryptokey) configure() {
current := c.tun.config.GetCurrent()
// Set enabled/disabled state
@ -72,14 +58,14 @@ func (c *cryptokey) configure() error {
// Add IPv6 routes
for ipv6, pubkey := range current.TunnelRouting.IPv6RemoteSubnets {
if err := c.addRemoteSubnet(ipv6, pubkey); err != nil {
return err
c.tun.log.Errorln("Error adding CKR IPv6 remote subnet:", err)
}
}
// Add IPv4 routes
for ipv4, pubkey := range current.TunnelRouting.IPv4RemoteSubnets {
if err := c.addRemoteSubnet(ipv4, pubkey); err != nil {
return err
c.tun.log.Errorln("Error adding CKR IPv4 remote subnet:", err)
}
}
@ -93,7 +79,7 @@ func (c *cryptokey) configure() error {
c.ipv6locals = make([]net.IPNet, 0)
for _, source := range current.TunnelRouting.IPv6LocalSubnets {
if err := c.addLocalSubnet(source); err != nil {
return err
c.tun.log.Errorln("Error adding CKR IPv6 local subnet:", err)
}
}
@ -101,7 +87,7 @@ func (c *cryptokey) configure() error {
c.ipv4locals = make([]net.IPNet, 0)
for _, source := range current.TunnelRouting.IPv4LocalSubnets {
if err := c.addLocalSubnet(source); err != nil {
return err
c.tun.log.Errorln("Error adding CKR IPv4 local subnet:", err)
}
}
@ -110,8 +96,6 @@ func (c *cryptokey) configure() error {
c.ipv4cache = make(map[address.Address]cryptokey_route, 0)
c.ipv6cache = make(map[address.Address]cryptokey_route, 0)
c.mutexcaches.Unlock()
return nil
}
// Enable or disable crypto-key routing.
@ -181,19 +165,19 @@ func (c *cryptokey) addLocalSubnet(cidr string) error {
} else if prefixsize == net.IPv4len*8 {
routingsources = &c.ipv4locals
} else {
return errors.New("Unexpected prefix size")
return errors.New("unexpected prefix size")
}
// Check if we already have this CIDR
for _, subnet := range *routingsources {
if subnet.String() == ipnet.String() {
return errors.New("Source subnet already configured")
return errors.New("local subnet already configured")
}
}
// Add the source subnet
*routingsources = append(*routingsources, *ipnet)
c.tun.log.Infoln("Added CKR source subnet", cidr)
c.tun.log.Infoln("Added CKR local subnet", cidr)
return nil
}
@ -226,7 +210,7 @@ func (c *cryptokey) addRemoteSubnet(cidr string, dest string) error {
routingtable = &c.ipv4remotes
routingcache = &c.ipv4cache
} else {
return errors.New("Unexpected prefix size")
return errors.New("unexpected prefix size")
}
// Is the route an Yggdrasil destination?
@ -235,19 +219,19 @@ func (c *cryptokey) addRemoteSubnet(cidr string, dest string) error {
copy(addr[:], ipaddr)
copy(snet[:], ipnet.IP)
if addr.IsValid() || snet.IsValid() {
return errors.New("Can't specify Yggdrasil destination as crypto-key route")
return errors.New("can't specify Yggdrasil destination as crypto-key route")
}
// Do we already have a route for this subnet?
for _, route := range *routingtable {
if route.subnet.String() == ipnet.String() {
return errors.New(fmt.Sprintf("Route already exists for %s", cidr))
return fmt.Errorf("remote subnet already exists for %s", cidr)
}
}
// Decode the public key
if bpk, err := hex.DecodeString(dest); err != nil {
return err
} else if len(bpk) != crypto.BoxPubKeyLen {
return errors.New(fmt.Sprintf("Incorrect key length for %s", dest))
return fmt.Errorf("incorrect key length for %s", dest)
} else {
// Add the new crypto-key route
var key crypto.BoxPubKey
@ -270,7 +254,7 @@ func (c *cryptokey) addRemoteSubnet(cidr string, dest string) error {
delete(*routingcache, k)
}
c.tun.log.Infoln("Added CKR destination subnet", cidr)
c.tun.log.Infoln("Added CKR remote subnet", cidr)
return nil
}
}
@ -284,7 +268,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
// Check if the address is a valid Yggdrasil address - if so it
// is exempt from all CKR checking
if addr.IsValid() {
return crypto.BoxPubKey{}, errors.New("Cannot look up CKR for Yggdrasil addresses")
return crypto.BoxPubKey{}, errors.New("cannot look up CKR for Yggdrasil addresses")
}
// Build our references to the routing table and cache
@ -297,7 +281,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
} else if addrlen == net.IPv4len {
routingcache = &c.ipv4cache
} else {
return crypto.BoxPubKey{}, errors.New("Unexpected prefix size")
return crypto.BoxPubKey{}, errors.New("unexpected prefix size")
}
// Check if there's a cache entry for this addr
@ -317,7 +301,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
} else if addrlen == net.IPv4len {
routingtable = &c.ipv4remotes
} else {
return crypto.BoxPubKey{}, errors.New("Unexpected prefix size")
return crypto.BoxPubKey{}, errors.New("unexpected prefix size")
}
// No cache was found - start by converting the address into a net.IP
@ -378,18 +362,18 @@ func (c *cryptokey) removeLocalSubnet(cidr string) error {
} else if prefixsize == net.IPv4len*8 {
routingsources = &c.ipv4locals
} else {
return errors.New("Unexpected prefix size")
return errors.New("unexpected prefix size")
}
// Check if we already have this CIDR
for idx, subnet := range *routingsources {
if subnet.String() == ipnet.String() {
*routingsources = append((*routingsources)[:idx], (*routingsources)[idx+1:]...)
c.tun.log.Infoln("Removed CKR source subnet", cidr)
c.tun.log.Infoln("Removed CKR local subnet", cidr)
return nil
}
}
return errors.New("Source subnet not found")
return errors.New("local subnet not found")
}
// Removes a destination route for the given CIDR to be tunnelled to the node
@ -421,7 +405,7 @@ func (c *cryptokey) removeRemoteSubnet(cidr string, dest string) error {
routingtable = &c.ipv4remotes
routingcache = &c.ipv4cache
} else {
return errors.New("Unexpected prefix size")
return errors.New("unexpected prefix size")
}
// Decode the public key
@ -429,7 +413,7 @@ func (c *cryptokey) removeRemoteSubnet(cidr string, dest string) error {
if err != nil {
return err
} else if len(bpk) != crypto.BoxPubKeyLen {
return errors.New(fmt.Sprintf("Incorrect key length for %s", dest))
return fmt.Errorf("incorrect key length for %s", dest)
}
netStr := ipnet.String()
@ -439,9 +423,9 @@ func (c *cryptokey) removeRemoteSubnet(cidr string, dest string) error {
for k := range *routingcache {
delete(*routingcache, k)
}
c.tun.log.Infof("Removed CKR destination subnet %s via %s\n", cidr, dest)
c.tun.log.Infof("Removed CKR remote subnet %s via %s\n", cidr, dest)
return nil
}
}
return errors.New(fmt.Sprintf("Route does not exists for %s", cidr))
return fmt.Errorf("route does not exists for %s", cidr)
}

25
src/tuntap/tun.go
View File

@ -13,6 +13,7 @@ import (
"errors"
"fmt"
"net"
//"sync"
"github.com/Arceliar/phony"
@ -200,29 +201,11 @@ func (tun *TunAdapter) _stop() error {
func (tun *TunAdapter) UpdateConfig(config *config.NodeConfig) {
tun.log.Debugln("Reloading TUN/TAP configuration...")
// Replace the active configuration with the supplied one
tun.config.Replace(*config)
errors := 0
components := []chan chan error{
tun.reconfigure,
tun.ckr.reconfigure,
}
for _, component := range components {
response := make(chan error)
component <- response
if err := <-response; err != nil {
tun.log.Errorln(err)
errors++
}
}
if errors > 0 {
tun.log.Warnln(errors, "TUN/TAP module(s) reported errors during configuration reload")
} else {
tun.log.Infoln("TUN/TAP configuration reloaded successfully")
}
// Notify children about the configuration change
tun.Act(nil, tun.ckr.configure)
}
func (tun *TunAdapter) handler() error {

44
src/yggdrasil/core.go
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@ -20,6 +20,7 @@ type Core struct {
// This is the main data structure that holds everything else for a node
// We're going to keep our own copy of the provided config - that way we can
// guarantee that it will be covered by the mutex
phony.Inbox
config config.NodeState // Config
boxPub crypto.BoxPubKey
boxPriv crypto.BoxPrivKey
@ -112,47 +113,14 @@ func (c *Core) addPeerLoop() {
// config.NodeConfig and then signals the various module goroutines to
// reconfigure themselves if needed.
func (c *Core) UpdateConfig(config *config.NodeConfig) {
c.log.Infoln("Reloading node configuration...")
c.log.Debugln("Reloading node configuration...")
// Replace the active configuration with the supplied one
c.config.Replace(*config)
errors := 0
// Each reconfigure function should pass any errors to the channel, then close it
components := map[phony.Actor][]func(chan error){
&c.router: []func(chan error){
c.router.reconfigure,
c.router.dht.reconfigure,
c.router.searches.reconfigure,
c.router.sessions.reconfigure,
},
&c.switchTable: []func(chan error){
c.switchTable.reconfigure,
c.link.reconfigure,
c.peers.reconfigure,
},
}
// TODO: We count errors here but honestly that provides us with absolutely no
// benefit over components reporting errors themselves, so maybe we can use
// actor.Act() here instead and stop counting errors
for actor, functions := range components {
for _, function := range functions {
response := make(chan error)
phony.Block(actor, func() {
function(response)
})
for err := range response {
c.log.Errorln(err)
errors++
}
}
}
if errors > 0 {
c.log.Warnln(errors, "node module(s) reported errors during configuration reload")
} else {
c.log.Infoln("Node configuration reloaded successfully")
}
// Notify the router and switch about the new configuration
c.router.Act(c, c.router.reconfigure)
c.switchTable.Act(c, c.switchTable.reconfigure)
}
// Start starts up Yggdrasil using the provided config.NodeConfig, and outputs

3
src/yggdrasil/dht.go
View File

@ -82,8 +82,7 @@ func (t *dht) init(r *router) {
t.reset()
}
func (t *dht) reconfigure(e chan error) {
defer close(e)
func (t *dht) reconfigure() {
// This is where reconfiguration would go, if we had anything to do
}

9
src/yggdrasil/link.go
View File

@ -79,13 +79,8 @@ func (l *link) init(c *Core) error {
return nil
}
func (l *link) reconfigure(e chan error) {
defer close(e)
tcpResponse := make(chan error)
l.tcp.reconfigure(tcpResponse)
for err := range tcpResponse {
e <- err
}
func (l *link) reconfigure() {
l.tcp.reconfigure()
}
func (l *link) call(uri string, sintf string) error {

3
src/yggdrasil/peer.go
View File

@ -34,8 +34,7 @@ func (ps *peers) init(c *Core) {
ps.core = c
}
func (ps *peers) reconfigure(e chan error) {
defer close(e)
func (ps *peers) reconfigure() {
// This is where reconfiguration would go, if we had anything to do
}

20
src/yggdrasil/router.go
View File

@ -73,18 +73,20 @@ func (r *router) init(core *Core) {
r.sessions.init(r)
}
func (r *router) reconfigure(e chan error) {
defer close(e)
var errs []error
// Reconfigures the router and any child modules. This should only ever be run
// by the router actor.
func (r *router) reconfigure() {
// Reconfigure the router
current := r.core.config.GetCurrent()
err := r.nodeinfo.setNodeInfo(current.NodeInfo, current.NodeInfoPrivacy)
if err != nil {
errs = append(errs, err)
}
for _, err := range errs {
e <- err
if err := r.nodeinfo.setNodeInfo(current.NodeInfo, current.NodeInfoPrivacy); err != nil {
r.core.log.Errorln("Error reloading NodeInfo:", err)
} else {
r.core.log.Infoln("NodeInfo updated")
}
// Reconfigure children
r.dht.reconfigure()
r.searches.reconfigure()
r.sessions.reconfigure()
}
// Starts the tickerLoop goroutine.

3
src/yggdrasil/search.go
View File

@ -55,8 +55,7 @@ func (s *searches) init(r *router) {
s.searches = make(map[crypto.NodeID]*searchInfo)
}
func (s *searches) reconfigure(e chan error) {
defer close(e)
func (s *searches) reconfigure() {
// This is where reconfiguration would go, if we had anything to do
}

17
src/yggdrasil/session.go
View File

@ -73,8 +73,7 @@ type sessionInfo struct {
callbacks []chan func() // Finished work from crypto workers
}
func (sinfo *sessionInfo) reconfigure(e chan error) {
defer close(e)
func (sinfo *sessionInfo) reconfigure() {
// This is where reconfiguration would go, if we had anything to do
}
@ -161,17 +160,9 @@ func (ss *sessions) init(r *router) {
ss.lastCleanup = time.Now()
}
func (ss *sessions) reconfigure(e chan error) {
defer close(e)
responses := make(map[crypto.Handle]chan error)
for index, session := range ss.sinfos {
responses[index] = make(chan error)
session.reconfigure(responses[index])
}
for _, response := range responses {
for err := range response {
e <- err
}
func (ss *sessions) reconfigure() {
for _, session := range ss.sinfos {
session.reconfigure()
}
}

5
src/yggdrasil/switch.go
View File

@ -199,9 +199,10 @@ func (t *switchTable) init(core *Core) {
})
}
func (t *switchTable) reconfigure(e chan error) {
defer close(e)
func (t *switchTable) reconfigure() {
// This is where reconfiguration would go, if we had anything useful to do.
t.core.link.reconfigure()
t.core.peers.reconfigure()
}
// Safely gets a copy of this node's locator.

8
src/yggdrasil/tcp.go
View File

@ -95,8 +95,7 @@ func (t *tcp) init(l *link) error {
return nil
}
func (t *tcp) reconfigure(e chan error) {
defer close(e)
func (t *tcp) reconfigure() {
t.link.core.config.Mutex.RLock()
added := util.Difference(t.link.core.config.Current.Listen, t.link.core.config.Previous.Listen)
deleted := util.Difference(t.link.core.config.Previous.Listen, t.link.core.config.Current.Listen)
@ -107,7 +106,9 @@ func (t *tcp) reconfigure(e chan error) {
continue
}
if _, err := t.listen(a[6:]); err != nil {
e <- err
t.link.core.log.Errorln("Error adding TCP", a[6:], "listener:", err)
} else {
t.link.core.log.Infoln("Started TCP listener:", a[6:])
}
}
for _, d := range deleted {
@ -118,6 +119,7 @@ func (t *tcp) reconfigure(e chan error) {
if listener, ok := t.listeners[d[6:]]; ok {
t.mutex.Unlock()
listener.Stop <- true
t.link.core.log.Infoln("Stopped TCP listener:", d[6:])
} else {
t.mutex.Unlock()
}