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Merge branch 'actors-linky' into actors

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This commit is contained in:
Arceliar 2019-08-26 00:38:29 -05:00
commit f432875d87
6 changed files with 224 additions and 258 deletions
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38
src/tuntap/iface.go
View File

@ -247,24 +247,26 @@ func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
}
if !known {
go func() {
if conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
tun.RecvFrom(nil, func() {
// We've been given a connection so prepare the session wrapper
packets := tun.dials[*dstNodeID]
delete(tun.dials, *dstNodeID)
var tc *tunConn
var err error
if tc, err = tun._wrap(conn); err != nil {
// Something went wrong when storing the connection, typically that
// something already exists for this address or subnet
tun.log.Debugln("TUN/TAP iface wrap:", err)
return
}
for _, packet := range packets {
tc.writeFrom(nil, packet)
}
})
}
conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask)
tun.RecvFrom(nil, func() {
packets := tun.dials[*dstNodeID]
delete(tun.dials, *dstNodeID)
if err != nil {
return
}
// We've been given a connection so prepare the session wrapper
var tc *tunConn
if tc, err = tun._wrap(conn); err != nil {
// Something went wrong when storing the connection, typically that
// something already exists for this address or subnet
tun.log.Debugln("TUN/TAP iface wrap:", err)
return
}
for _, packet := range packets {
tc.writeFrom(nil, packet)
}
})
return
}()
}
}

2
src/yggdrasil/conn.go
View File

@ -304,6 +304,8 @@ func (c *Conn) Close() (err error) {
// Close the session, if it hasn't been closed already
if e := c.session.cancel.Cancel(errors.New("connection closed")); e != nil {
err = ConnError{errors.New("close failed, session already closed"), false, false, true, 0}
} else {
c.session.doRemove()
}
}
})

7
src/yggdrasil/debug.go
View File

@ -554,7 +554,8 @@ func (c *Core) DEBUG_addAllowedEncryptionPublicKey(boxStr string) {
func DEBUG_simLinkPeers(p, q *peer) {
// Sets q.out() to point to p and starts p.start()
goWorkers := func(source, dest *peer) {
source.linkOut = make(chan []byte, 1)
linkOut := make(chan []byte, 1)
source.linkOut = func(bs []byte) { linkOut <- bs }
send := make(chan []byte, 1)
source.out = func(bss [][]byte) {
for _, bs := range bss {
@ -566,7 +567,7 @@ func DEBUG_simLinkPeers(p, q *peer) {
var packets [][]byte
for {
select {
case packet := <-source.linkOut:
case packet := <-linkOut:
packets = append(packets, packet)
continue
case packet := <-send:
@ -583,7 +584,7 @@ func DEBUG_simLinkPeers(p, q *peer) {
continue
}
select {
case packet := <-source.linkOut:
case packet := <-linkOut:
packets = append(packets, packet)
case packet := <-send:
packets = append(packets, packet)

410
src/yggdrasil/link.go
View File

@ -46,14 +46,23 @@ type linkInterfaceMsgIO interface {
}
type linkInterface struct {
name string
link *link
peer *peer
msgIO linkInterfaceMsgIO
info linkInfo
incoming bool
force bool
closed chan struct{}
name string
link *link
peer *peer
msgIO linkInterfaceMsgIO
info linkInfo
incoming bool
force bool
closed chan struct{}
reader linkReader // Reads packets, notifies this linkInterface, passes packets to switch
writer linkWriter // Writes packets, notifies this linkInterface
phony.Inbox // Protects the below
sendTimer *time.Timer // Fires to signal that sending is blocked
stallTimer *time.Timer // Fires to signal that no incoming traffic (including keep-alive) has been seen
recvTimer *time.Timer // Fires to send keep-alive traffic
closeTimer *time.Timer // Fires when the link has been idle so long we need to close it
inSwitch bool // True if the switch is tracking this link
stalled bool // True if we haven't been receiving any response traffic
}
func (l *link) init(c *Core) error {
@ -124,6 +133,9 @@ func (l *link) create(msgIO linkInterfaceMsgIO, name, linkType, local, remote st
incoming: incoming,
force: force,
}
intf.writer.intf = &intf
intf.reader.intf = &intf
intf.reader.err = make(chan error)
return &intf, nil
}
@ -202,230 +214,188 @@ func (intf *linkInterface) handler() error {
// More cleanup can go here
intf.link.core.peers.removePeer(intf.peer.port)
}()
// Finish setting up the peer struct
out := make(chan [][]byte, 1)
defer close(out)
intf.peer.out = func(msgs [][]byte) {
defer func() { recover() }()
out <- msgs
intf.writer.sendFrom(intf.peer, msgs, false)
}
intf.peer.linkOut = func(bs []byte) {
intf.writer.sendFrom(intf.peer, [][]byte{bs}, true)
}
intf.peer.linkOut = make(chan []byte, 1)
themAddr := address.AddrForNodeID(crypto.GetNodeID(&intf.info.box))
themAddrString := net.IP(themAddr[:]).String()
themString := fmt.Sprintf("%s@%s", themAddrString, intf.info.remote)
intf.link.core.log.Infof("Connected %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
// Start the link loop
// Start things
go intf.peer.start()
// Start the writer
signalReady := make(chan struct{}, 1)
signalSent := make(chan bool, 1)
sendAck := make(chan struct{}, 1)
sendBlocked := time.NewTimer(time.Second)
defer util.TimerStop(sendBlocked)
util.TimerStop(sendBlocked)
go func() {
defer close(signalReady)
defer close(signalSent)
interval := 4 * time.Second
tcpTimer := time.NewTimer(interval) // used for backwards compat with old tcp
defer util.TimerStop(tcpTimer)
send := func(bss [][]byte) {
sendBlocked.Reset(time.Second)
size, _ := intf.msgIO.writeMsgs(bss)
util.TimerStop(sendBlocked)
select {
case signalSent <- size > 0:
default:
}
}
for {
// First try to send any link protocol traffic
select {
case msg := <-intf.peer.linkOut:
send([][]byte{msg})
continue
default:
}
// No protocol traffic to send, so reset the timer
util.TimerStop(tcpTimer)
tcpTimer.Reset(interval)
// Now block until something is ready or the timer triggers keepalive traffic
select {
case <-tcpTimer.C:
intf.link.core.log.Tracef("Sending (legacy) keep-alive to %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
send([][]byte{nil})
case <-sendAck:
intf.link.core.log.Tracef("Sending ack to %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
send([][]byte{nil})
case msg := <-intf.peer.linkOut:
send([][]byte{msg})
case msgs, ok := <-out:
if !ok {
return
}
send(msgs)
for _, msg := range msgs {
util.PutBytes(msg)
}
select {
case signalReady <- struct{}{}:
default:
}
//intf.link.core.log.Tracef("Sending packet to %s: %s, source %s",
// strings.ToUpper(intf.info.linkType), themString, intf.info.local)
}
}
}()
//intf.link.core.switchTable.idleIn <- intf.peer.port // notify switch that we're idle
// Used to enable/disable activity in the switch
signalAlive := make(chan bool, 1) // True = real packet, false = keep-alive
defer close(signalAlive)
ret := make(chan error, 1) // How we signal the return value when multiple goroutines are involved
go func() {
var isAlive bool
var isReady bool
var sendTimerRunning bool
var recvTimerRunning bool
recvTime := 6 * time.Second // TODO set to ReadTimeout from the config, reset if it gets changed
closeTime := 2 * switch_timeout // TODO or maybe this makes more sense for ReadTimeout?...
sendTime := time.Second
sendTimer := time.NewTimer(sendTime)
defer util.TimerStop(sendTimer)
recvTimer := time.NewTimer(recvTime)
defer util.TimerStop(recvTimer)
closeTimer := time.NewTimer(closeTime)
defer util.TimerStop(closeTimer)
for {
//intf.link.core.log.Debugf("State of %s: %s, source %s :: isAlive %t isReady %t sendTimerRunning %t recvTimerRunning %t",
// strings.ToUpper(intf.info.linkType), themString, intf.info.local,
// isAlive, isReady, sendTimerRunning, recvTimerRunning)
select {
case gotMsg, ok := <-signalAlive:
if !ok {
return
}
util.TimerStop(closeTimer)
closeTimer.Reset(closeTime)
util.TimerStop(recvTimer)
recvTimerRunning = false
isAlive = true
if !isReady {
// (Re-)enable in the switch
intf.link.core.switchTable.RecvFrom(nil, func() {
intf.link.core.switchTable._idleIn(intf.peer.port)
})
isReady = true
}
if gotMsg && !sendTimerRunning {
// We got a message
// Start a timer, if it expires then send a 0-sized ack to let them know we're alive
util.TimerStop(sendTimer)
sendTimer.Reset(sendTime)
sendTimerRunning = true
}
if !gotMsg {
intf.link.core.log.Tracef("Received ack from %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
}
case sentMsg, ok := <-signalSent:
// Stop any running ack timer
if !ok {
return
}
util.TimerStop(sendTimer)
sendTimerRunning = false
if sentMsg && !recvTimerRunning {
// We sent a message
// Start a timer, if it expires and we haven't gotten any return traffic (including a 0-sized ack), then assume there's a problem
util.TimerStop(recvTimer)
recvTimer.Reset(recvTime)
recvTimerRunning = true
}
case _, ok := <-signalReady:
if !ok {
return
}
if !isAlive {
// Disable in the switch
isReady = false
} else {
// Keep enabled in the switch
intf.link.core.switchTable.RecvFrom(nil, func() {
intf.link.core.switchTable._idleIn(intf.peer.port)
})
isReady = true
}
case <-sendBlocked.C:
// We blocked while trying to send something
isReady = false
intf.link.core.switchTable.blockPeer(intf.peer.port)
case <-sendTimer.C:
// We haven't sent anything, so signal a send of a 0 packet to let them know we're alive
select {
case sendAck <- struct{}{}:
default:
}
case <-recvTimer.C:
// We haven't received anything, so assume there's a problem and don't return this node to the switch until they start responding
isAlive = false
intf.link.core.switchTable.blockPeer(intf.peer.port)
case <-closeTimer.C:
// We haven't received anything in a really long time, so things have died at the switch level and then some...
// Just close the connection at this point...
select {
case ret <- errors.New("timeout"):
default:
}
intf.msgIO.close()
}
}
}()
// Run reader loop
var helper phony.Inbox
done := make(chan struct{})
var helperFunc func()
helperFunc = func() {
// The helper reads in a loop and sends to the peer
// It loops by sending itself a message, which can be delayed by backpressure
// So if the peer is busy, backpressure will pause reading until the peer catches up
msg, err := intf.msgIO.readMsg()
if len(msg) > 0 {
// TODO rewrite this if the link becomes an actor
intf.peer.handlePacketFrom(&helper, msg)
}
if err != nil {
if err != io.EOF {
select {
case ret <- err:
default:
}
}
close(done)
return
}
select {
case signalAlive <- len(msg) > 0:
default:
}
// Now try to read again
helper.RecvFrom(nil, helperFunc)
}
// Start the read loop
helper.RecvFrom(nil, helperFunc)
<-done // Wait for the helper to exit
////////////////////////////////////////////////////////////////////////////////
// Remember to set `err` to something useful before returning
select {
case err = <-ret:
intf.reader.RecvFrom(nil, intf.reader._read)
// Wait for the reader to finish
err = <-intf.reader.err
if err != nil {
intf.link.core.log.Infof("Disconnected %s: %s, source %s; error: %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local, err)
default:
err = nil
} else {
intf.link.core.log.Infof("Disconnected %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
}
return err
}
////////////////////////////////////////////////////////////////////////////////
const (
sendBlockedTime = time.Second // How long to wait before deciding a send is blocked
keepAliveTime = 2 * time.Second // How long to wait before sending a keep-alive response if we have no real traffic to send
stallTime = 6 * time.Second // How long to wait for response traffic before deciding the connection has stalled
closeTime = 2 * switch_timeout // How long to wait before closing the link
)
// notify the intf that we're currently sending
func (intf *linkInterface) notifySending(size int, isLinkTraffic bool) {
intf.RecvFrom(nil, func() {
if !isLinkTraffic {
intf.inSwitch = false
}
intf.sendTimer = time.AfterFunc(sendBlockedTime, intf.notifyBlockedSend)
intf._cancelRecvTimer()
})
}
// we just sent something, so cancel any pending timer to send keep-alive traffic
func (intf *linkInterface) _cancelRecvTimer() {
intf.RecvFrom(nil, func() {
if intf.recvTimer != nil {
intf.recvTimer.Stop()
intf.recvTimer = nil
}
})
}
// called by an AfterFunc if we appear to have timed out
func (intf *linkInterface) notifyBlockedSend() {
intf.RecvFrom(nil, func() {
if intf.sendTimer != nil {
//As far as we know, we're still trying to send, and the timer fired.
intf.link.core.switchTable.blockPeer(intf.peer.port)
}
})
}
// notify the intf that we've finished sending, returning the peer to the switch
func (intf *linkInterface) notifySent(size int, isLinkTraffic bool) {
intf.RecvFrom(nil, func() {
intf.sendTimer.Stop()
intf.sendTimer = nil
if !isLinkTraffic {
intf._notifySwitch()
}
if size > 0 && intf.stallTimer == nil {
intf.stallTimer = time.AfterFunc(stallTime, intf.notifyStalled)
}
})
}
// Notify the switch that we're ready for more traffic, assuming we're not in a stalled state
func (intf *linkInterface) _notifySwitch() {
if !intf.inSwitch && !intf.stalled {
intf.inSwitch = true
intf.link.core.switchTable.RecvFrom(intf, func() {
intf.link.core.switchTable._idleIn(intf.peer.port)
})
}
}
// Set the peer as stalled, to prevent them from returning to the switch until a read succeeds
func (intf *linkInterface) notifyStalled() {
intf.RecvFrom(nil, func() {
if intf.stallTimer != nil {
intf.stallTimer = nil
intf.stalled = true
intf.link.core.switchTable.blockPeer(intf.peer.port)
}
})
}
// reset the close timer
func (intf *linkInterface) notifyReading(from phony.Actor) {
intf.RecvFrom(from, func() {
if intf.closeTimer != nil {
intf.closeTimer.Stop()
}
intf.closeTimer = time.AfterFunc(closeTime, func() { intf.msgIO.close() })
})
}
// wake up the link if it was stalled, and (if size > 0) prepare to send keep-alive traffic
func (intf *linkInterface) notifyReadFrom(from phony.Actor, size int) {
intf.RecvFrom(from, func() {
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
}
intf.stalled = false
intf._notifySwitch()
if size > 0 && intf.recvTimer == nil {
intf.recvTimer = time.AfterFunc(keepAliveTime, intf.notifyDoKeepAlive)
}
})
}
// We need to send keep-alive traffic now
func (intf *linkInterface) notifyDoKeepAlive() {
intf.RecvFrom(nil, func() {
if intf.recvTimer != nil {
intf.recvTimer.Stop()
intf.recvTimer = nil
intf.writer.sendFrom(nil, [][]byte{nil}, true) // Empty keep-alive traffic
}
})
}
////////////////////////////////////////////////////////////////////////////////
type linkWriter struct {
phony.Inbox
intf *linkInterface
}
func (w *linkWriter) sendFrom(from phony.Actor, bss [][]byte, isLinkTraffic bool) {
w.RecvFrom(from, func() {
var size int
for _, bs := range bss {
size += len(bs)
}
w.intf.notifySending(size, isLinkTraffic)
w.intf.msgIO.writeMsgs(bss)
w.intf.notifySent(size, isLinkTraffic)
// Cleanup
for _, bs := range bss {
util.PutBytes(bs)
}
})
}
////////////////////////////////////////////////////////////////////////////////
type linkReader struct {
phony.Inbox
intf *linkInterface
err chan error
}
func (r *linkReader) _read() {
r.intf.notifyReading(r)
msg, err := r.intf.msgIO.readMsg()
r.intf.notifyReadFrom(r, len(msg))
if len(msg) > 0 {
r.intf.peer.handlePacketFrom(r, msg)
}
if err != nil {
if err != io.EOF {
r.err <- err
}
close(r.err)
return
}
// Now try to read again
r.RecvFrom(nil, r._read)
}

12
src/yggdrasil/peer.go
View File

@ -103,7 +103,7 @@ type peer struct {
linkShared crypto.BoxSharedKey
endpoint string
firstSeen time.Time // To track uptime for getPeers
linkOut (chan []byte) // used for protocol traffic (to bypass queues)
linkOut func([]byte) // used for protocol traffic (bypasses the switch)
dinfo *dhtInfo // used to keep the DHT working
out func([][]byte) // Set up by whatever created the peers struct, used to send packets to other nodes
done (chan struct{}) // closed to exit the linkLoop
@ -263,8 +263,6 @@ func (p *peer) _sendPackets(packets [][]byte) {
p.out(packets)
}
var peerLinkOutHelper phony.Inbox
// This wraps the packet in the inner (ephemeral) and outer (permanent) crypto layers.
// It sends it to p.linkOut, which bypasses the usual packet queues.
func (p *peer) _sendLinkPacket(packet []byte) {
@ -280,13 +278,7 @@ func (p *peer) _sendLinkPacket(packet []byte) {
Payload: bs,
}
packet = linkPacket.encode()
// TODO replace this with a message send if/when the link becomes an actor
peerLinkOutHelper.RecvFrom(nil, func() {
select {
case p.linkOut <- packet:
case <-p.done:
}
})
p.linkOut(packet)
}
// Decrypts the outer (permanent) and inner (ephemeral) crypto layers on link traffic.

13
src/yggdrasil/session.go
View File

@ -255,13 +255,6 @@ func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
sinfo.theirSubnet = *address.SubnetForNodeID(crypto.GetNodeID(&sinfo.theirPermPub))
ss.sinfos[sinfo.myHandle] = &sinfo
ss.byTheirPerm[sinfo.theirPermPub] = &sinfo.myHandle
go func() {
// Run cleanup when the session is canceled
<-sinfo.cancel.Finished()
sinfo.sessions.router.doAdmin(func() {
sinfo.sessions.removeSession(&sinfo)
})
}()
return &sinfo
}
@ -293,6 +286,12 @@ func (ss *sessions) cleanup() {
ss.lastCleanup = time.Now()
}
func (sinfo *sessionInfo) doRemove() {
sinfo.sessions.router.RecvFrom(nil, func() {
sinfo.sessions.removeSession(sinfo)
})
}
// Closes a session, removing it from sessions maps.
func (ss *sessions) removeSession(sinfo *sessionInfo) {
if s := sinfo.sessions.sinfos[sinfo.myHandle]; s == sinfo {