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Merge pull request #693 from Arceliar/buffers

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Update queue behavior
This commit is contained in:
Arceliar 2020-05-24 09:41:20 -05:00 committed by GitHub
commit 28d6e3e605
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GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 321 additions and 251 deletions
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14
src/yggdrasil/api.go
View File

@ -123,10 +123,10 @@ func (c *Core) GetPeers() []Peer {
var info Peer
phony.Block(p, func() {
info = Peer{
Endpoint: p.intf.name,
Endpoint: p.intf.name(),
BytesSent: p.bytesSent,
BytesRecvd: p.bytesRecvd,
Protocol: p.intf.info.linkType,
Protocol: p.intf.interfaceType(),
Port: uint64(port),
Uptime: time.Since(p.firstSeen),
}
@ -163,8 +163,8 @@ func (c *Core) GetSwitchPeers() []SwitchPeer {
BytesSent: peer.bytesSent,
BytesRecvd: peer.bytesRecvd,
Port: uint64(elem.port),
Protocol: peer.intf.info.linkType,
Endpoint: peer.intf.info.remote,
Protocol: peer.intf.interfaceType(),
Endpoint: peer.intf.remote(),
}
copy(info.PublicKey[:], peer.box[:])
})
@ -257,14 +257,14 @@ func (c *Core) ConnDialer() (*Dialer, error) {
// "Listen" configuration item, e.g.
// tcp://a.b.c.d:e
func (c *Core) ListenTCP(uri string) (*TcpListener, error) {
return c.link.tcp.listen(uri, nil)
return c.links.tcp.listen(uri, nil)
}
// ListenTLS starts a new TLS listener. The input URI should match that of the
// "Listen" configuration item, e.g.
// tls://a.b.c.d:e
func (c *Core) ListenTLS(uri string) (*TcpListener, error) {
return c.link.tcp.listen(uri, c.link.tcp.tls.forListener)
return c.links.tcp.listen(uri, c.links.tcp.tls.forListener)
}
// NodeID gets the node ID. This is derived from your router encryption keys.
@ -463,7 +463,7 @@ func (c *Core) RemovePeer(addr string, sintf string) error {
// This does not add the peer to the peer list, so if the connection drops, the
// peer will not be called again automatically.
func (c *Core) CallPeer(addr string, sintf string) error {
return c.link.call(addr, sintf)
return c.links.call(addr, sintf)
}
// DisconnectPeer disconnects a peer once. This should be specified as a port

6
src/yggdrasil/core.go
View File

@ -29,7 +29,7 @@ type Core struct {
switchTable switchTable
peers peers
router router
link link
links links
log *log.Logger
addPeerTimer *time.Timer
}
@ -165,7 +165,7 @@ func (c *Core) _start(nc *config.NodeConfig, log *log.Logger) (*config.NodeState
return nil, err
}
if err := c.link.init(c); err != nil {
if err := c.links.init(c); err != nil {
c.log.Errorln("Failed to start link interfaces")
return nil, err
}
@ -197,7 +197,7 @@ func (c *Core) _stop() {
if c.addPeerTimer != nil {
c.addPeerTimer.Stop()
}
c.link.stop()
c.links.stop()
/* FIXME this deadlocks, need a waitgroup or something to coordinate shutdown
for _, peer := range c.GetPeers() {
c.DisconnectPeer(peer.Port)

277
src/yggdrasil/link.go
View File

@ -21,12 +21,12 @@ import (
"github.com/Arceliar/phony"
)
type link struct {
core *Core
mutex sync.RWMutex // protects interfaces below
interfaces map[linkInfo]*linkInterface
tcp tcp // TCP interface support
stopped chan struct{}
type links struct {
core *Core
mutex sync.RWMutex // protects links below
links map[linkInfo]*link
tcp tcp // TCP interface support
stopped chan struct{}
// TODO timeout (to remove from switch), read from config.ReadTimeout
}
@ -38,7 +38,7 @@ type linkInfo struct {
remote string // Remote name or address
}
type linkInterfaceMsgIO interface {
type linkMsgIO interface {
readMsg() ([]byte, error)
writeMsgs([][]byte) (int, error)
close() error
@ -47,26 +47,25 @@ type linkInterfaceMsgIO interface {
_recvMetaBytes() ([]byte, error)
}
type linkInterface struct {
name string
link *link
type link struct {
lname string
links *links
peer *peer
options linkOptions
msgIO linkInterfaceMsgIO
msgIO linkMsgIO
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
reader linkReader // Reads packets, notifies this link, passes packets to switch
writer linkWriter // Writes packets, notifies this link
phony.Inbox // Protects the below
sendTimer *time.Timer // Fires to signal that sending is blocked
keepAliveTimer *time.Timer // Fires to send keep-alive traffic
stallTimer *time.Timer // Fires to signal that no incoming traffic (including keep-alive) has been seen
closeTimer *time.Timer // Fires when the link has been idle so long we need to close it
isIdle bool // True if the peer actor knows the link is idle
stalled bool // True if we haven't been receiving any response traffic
unstalled bool // False if an idle notification to the switch hasn't been sent because we stalled (or are first starting up)
isSending bool // True between a notifySending and a notifySent
blocked bool // True if we've blocked the peer in the switch
}
type linkOptions struct {
@ -74,10 +73,10 @@ type linkOptions struct {
pinnedEd25519Keys map[crypto.SigPubKey]struct{}
}
func (l *link) init(c *Core) error {
func (l *links) init(c *Core) error {
l.core = c
l.mutex.Lock()
l.interfaces = make(map[linkInfo]*linkInterface)
l.links = make(map[linkInfo]*link)
l.mutex.Unlock()
l.stopped = make(chan struct{})
@ -89,11 +88,11 @@ func (l *link) init(c *Core) error {
return nil
}
func (l *link) reconfigure() {
func (l *links) reconfigure() {
l.tcp.reconfigure()
}
func (l *link) call(uri string, sintf string) error {
func (l *links) call(uri string, sintf string) error {
u, err := url.Parse(uri)
if err != nil {
return fmt.Errorf("peer %s is not correctly formatted (%s)", uri, err)
@ -140,7 +139,7 @@ func (l *link) call(uri string, sintf string) error {
return nil
}
func (l *link) listen(uri string) error {
func (l *links) listen(uri string) error {
u, err := url.Parse(uri)
if err != nil {
return fmt.Errorf("listener %s is not correctly formatted (%s)", uri, err)
@ -157,11 +156,11 @@ func (l *link) listen(uri string) error {
}
}
func (l *link) create(msgIO linkInterfaceMsgIO, name, linkType, local, remote string, incoming, force bool, options linkOptions) (*linkInterface, error) {
func (l *links) create(msgIO linkMsgIO, name, linkType, local, remote string, incoming, force bool, options linkOptions) (*link, error) {
// Technically anything unique would work for names, but let's pick something human readable, just for debugging
intf := linkInterface{
name: name,
link: l,
intf := link{
lname: name,
links: l,
options: options,
msgIO: msgIO,
info: linkInfo{
@ -173,12 +172,13 @@ func (l *link) create(msgIO linkInterfaceMsgIO, name, linkType, local, remote st
force: force,
}
intf.writer.intf = &intf
intf.writer.worker = make(chan [][]byte, 1)
intf.reader.intf = &intf
intf.reader.err = make(chan error)
return &intf, nil
}
func (l *link) stop() error {
func (l *links) stop() error {
close(l.stopped)
if err := l.tcp.stop(); err != nil {
return err
@ -186,12 +186,21 @@ func (l *link) stop() error {
return nil
}
func (intf *linkInterface) handler() error {
func (intf *link) handler() error {
// TODO split some of this into shorter functions, so it's easier to read, and for the FIXME duplicate peer issue mentioned later
go func() {
for bss := range intf.writer.worker {
intf.msgIO.writeMsgs(bss)
}
}()
defer intf.writer.Act(nil, func() {
intf.writer.closed = true
close(intf.writer.worker)
})
myLinkPub, myLinkPriv := crypto.NewBoxKeys()
meta := version_getBaseMetadata()
meta.box = intf.link.core.boxPub
meta.sig = intf.link.core.sigPub
meta.box = intf.links.core.boxPub
meta.sig = intf.links.core.sigPub
meta.link = *myLinkPub
metaBytes := meta.encode()
// TODO timeouts on send/recv (goroutine for send/recv, channel select w/ timer)
@ -214,26 +223,26 @@ func (intf *linkInterface) handler() error {
}
base := version_getBaseMetadata()
if meta.ver > base.ver || meta.ver == base.ver && meta.minorVer > base.minorVer {
intf.link.core.log.Errorln("Failed to connect to node: " + intf.name + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
intf.links.core.log.Errorln("Failed to connect to node: " + intf.lname + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
return errors.New("failed to connect: wrong version")
}
// Check if the remote side matches the keys we expected. This is a bit of a weak
// check - in future versions we really should check a signature or something like that.
if pinned := intf.options.pinnedCurve25519Keys; pinned != nil {
if _, allowed := pinned[meta.box]; !allowed {
intf.link.core.log.Errorf("Failed to connect to node: %q sent curve25519 key that does not match pinned keys", intf.name)
intf.links.core.log.Errorf("Failed to connect to node: %q sent curve25519 key that does not match pinned keys", intf.name)
return fmt.Errorf("failed to connect: host sent curve25519 key that does not match pinned keys")
}
}
if pinned := intf.options.pinnedEd25519Keys; pinned != nil {
if _, allowed := pinned[meta.sig]; !allowed {
intf.link.core.log.Errorf("Failed to connect to node: %q sent ed25519 key that does not match pinned keys", intf.name)
intf.links.core.log.Errorf("Failed to connect to node: %q sent ed25519 key that does not match pinned keys", intf.name)
return fmt.Errorf("failed to connect: host sent ed25519 key that does not match pinned keys")
}
}
// Check if we're authorized to connect to this key / IP
if intf.incoming && !intf.force && !intf.link.core.peers.isAllowedEncryptionPublicKey(&meta.box) {
intf.link.core.log.Warnf("%s connection from %s forbidden: AllowedEncryptionPublicKeys does not contain key %s",
if intf.incoming && !intf.force && !intf.links.core.peers.isAllowedEncryptionPublicKey(&meta.box) {
intf.links.core.log.Warnf("%s connection from %s forbidden: AllowedEncryptionPublicKeys does not contain key %s",
strings.ToUpper(intf.info.linkType), intf.info.remote, hex.EncodeToString(meta.box[:]))
intf.msgIO.close()
return nil
@ -241,12 +250,12 @@ func (intf *linkInterface) handler() error {
// Check if we already have a link to this node
intf.info.box = meta.box
intf.info.sig = meta.sig
intf.link.mutex.Lock()
if oldIntf, isIn := intf.link.interfaces[intf.info]; isIn {
intf.link.mutex.Unlock()
intf.links.mutex.Lock()
if oldIntf, isIn := intf.links.links[intf.info]; isIn {
intf.links.mutex.Unlock()
// FIXME we should really return an error and let the caller block instead
// That lets them do things like close connections on its own, avoid printing a connection message in the first place, etc.
intf.link.core.log.Debugln("DEBUG: found existing interface for", intf.name)
intf.links.core.log.Debugln("DEBUG: found existing interface for", intf.name)
intf.msgIO.close()
if !intf.incoming {
// Block outgoing connection attempts until the existing connection closes
@ -255,35 +264,21 @@ func (intf *linkInterface) handler() error {
return nil
} else {
intf.closed = make(chan struct{})
intf.link.interfaces[intf.info] = intf
intf.links.links[intf.info] = intf
defer func() {
intf.link.mutex.Lock()
delete(intf.link.interfaces, intf.info)
intf.link.mutex.Unlock()
intf.links.mutex.Lock()
delete(intf.links.links, intf.info)
intf.links.mutex.Unlock()
close(intf.closed)
}()
intf.link.core.log.Debugln("DEBUG: registered interface for", intf.name)
intf.links.core.log.Debugln("DEBUG: registered interface for", intf.name)
}
intf.link.mutex.Unlock()
intf.links.mutex.Unlock()
// Create peer
shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
out := func(msgs [][]byte) {
// nil to prevent it from blocking if the link is somehow frozen
// this is safe because another packet won't be sent until the link notifies
// the peer that it's ready for one
intf.writer.sendFrom(nil, msgs, false)
}
linkOut := func(bs []byte) {
// nil to prevent it from blocking if the link is somehow frozen
// FIXME this is hypothetically not safe, the peer shouldn't be sending
// additional packets until this one finishes, otherwise this could leak
// memory if writing happens slower than link packets are generated...
// that seems unlikely, so it's a lesser evil than deadlocking for now
intf.writer.sendFrom(nil, [][]byte{bs}, true)
}
phony.Block(&intf.link.core.peers, func() {
phony.Block(&intf.links.core.peers, func() {
// FIXME don't use phony.Block, it's bad practice, even if it's safe here
intf.peer = intf.link.core.peers._newPeer(&meta.box, &meta.sig, shared, intf, func() { intf.msgIO.close() }, out, linkOut)
intf.peer = intf.links.core.peers._newPeer(&meta.box, &meta.sig, shared, intf)
})
if intf.peer == nil {
return errors.New("failed to create peer")
@ -295,10 +290,11 @@ func (intf *linkInterface) handler() error {
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",
intf.links.core.log.Infof("Connected %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
// Start things
go intf.peer.start()
intf.Act(nil, intf._notifyIdle)
intf.reader.Act(nil, intf.reader._read)
// Wait for the reader to finish
// TODO find a way to do this without keeping live goroutines around
@ -306,7 +302,7 @@ func (intf *linkInterface) handler() error {
defer close(done)
go func() {
select {
case <-intf.link.stopped:
case <-intf.links.stopped:
intf.msgIO.close()
case <-done:
}
@ -314,10 +310,10 @@ func (intf *linkInterface) handler() error {
err = <-intf.reader.err
// TODO don't report an error if it's just a 'use of closed network connection'
if err != nil {
intf.link.core.log.Infof("Disconnected %s: %s, source %s; error: %s",
intf.links.core.log.Infof("Disconnected %s: %s, source %s; error: %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local, err)
} else {
intf.link.core.log.Infof("Disconnected %s: %s, source %s",
intf.links.core.log.Infof("Disconnected %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
}
return err
@ -325,6 +321,70 @@ func (intf *linkInterface) handler() error {
////////////////////////////////////////////////////////////////////////////////
// link needs to match the linkInterface type needed by the peers
type linkInterface interface {
out([][]byte)
linkOut([]byte)
notifyQueued(uint64)
close()
// These next ones are only used by the API
name() string
local() string
remote() string
interfaceType() string
}
func (intf *link) out(bss [][]byte) {
intf.Act(nil, func() {
// nil to prevent it from blocking if the link is somehow frozen
// this is safe because another packet won't be sent until the link notifies
// the peer that it's ready for one
intf.writer.sendFrom(nil, bss)
})
}
func (intf *link) linkOut(bs []byte) {
intf.Act(nil, func() {
// nil to prevent it from blocking if the link is somehow frozen
// FIXME this is hypothetically not safe, the peer shouldn't be sending
// additional packets until this one finishes, otherwise this could leak
// memory if writing happens slower than link packets are generated...
// that seems unlikely, so it's a lesser evil than deadlocking for now
intf.writer.sendFrom(nil, [][]byte{bs})
})
}
func (intf *link) notifyQueued(seq uint64) {
// This is the part where we want non-nil 'from' fields
intf.Act(intf.peer, func() {
if intf.isSending {
intf.peer.dropFromQueue(intf, seq)
}
})
}
func (intf *link) close() {
intf.Act(nil, func() { intf.msgIO.close() })
}
func (intf *link) name() string {
return intf.lname
}
func (intf *link) local() string {
return intf.info.local
}
func (intf *link) remote() string {
return intf.info.remote
}
func (intf *link) interfaceType() string {
return intf.info.linkType
}
////////////////////////////////////////////////////////////////////////////////
const (
sendTime = 1 * 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
@ -333,18 +393,16 @@ const (
)
// notify the intf that we're currently sending
func (intf *linkInterface) notifySending(size int, isLinkTraffic bool) {
func (intf *link) notifySending(size int) {
intf.Act(&intf.writer, func() {
if !isLinkTraffic {
intf.isIdle = false
}
intf.isSending = true
intf.sendTimer = time.AfterFunc(sendTime, intf.notifyBlockedSend)
intf._cancelStallTimer()
})
}
// we just sent something, so cancel any pending timer to send keep-alive traffic
func (intf *linkInterface) _cancelStallTimer() {
func (intf *link) _cancelStallTimer() {
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
@ -354,55 +412,55 @@ func (intf *linkInterface) _cancelStallTimer() {
// This gets called from a time.AfterFunc, and notifies the switch that we appear
// to have gotten blocked on a write, so the switch should start routing traffic
// through other links, if alternatives exist
func (intf *linkInterface) notifyBlockedSend() {
func (intf *link) notifyBlockedSend() {
intf.Act(nil, func() {
if intf.sendTimer != nil {
if intf.sendTimer != nil && !intf.blocked {
//As far as we know, we're still trying to send, and the timer fired.
intf.link.core.switchTable.blockPeer(intf, intf.peer.port)
intf.blocked = true
intf.links.core.switchTable.blockPeer(intf, 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) {
func (intf *link) notifySent(size int) {
intf.Act(&intf.writer, func() {
intf.sendTimer.Stop()
intf.sendTimer = nil
if !isLinkTraffic {
intf._notifyIdle()
if intf.sendTimer != nil {
intf.sendTimer.Stop()
intf.sendTimer = nil
}
if intf.keepAliveTimer != nil {
// TODO? unset this when we start sending, not when we finish...
intf.keepAliveTimer.Stop()
intf.keepAliveTimer = nil
}
intf._notifyIdle()
intf.isSending = false
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) _notifyIdle() {
if !intf.isIdle {
if intf.stalled {
intf.unstalled = false
} else {
intf.isIdle = true
intf.peer.Act(intf, intf.peer._handleIdle)
}
}
// Notify the peer that we're ready for more traffic
func (intf *link) _notifyIdle() {
intf.peer.Act(intf, intf.peer._handleIdle)
}
// Set the peer as stalled, to prevent them from returning to the switch until a read succeeds
func (intf *linkInterface) notifyStalled() {
func (intf *link) notifyStalled() {
intf.Act(nil, func() { // Sent from a time.AfterFunc
if intf.stallTimer != nil {
if intf.stallTimer != nil && !intf.blocked {
intf.stallTimer.Stop()
intf.stallTimer = nil
intf.stalled = true
intf.link.core.switchTable.blockPeer(intf, intf.peer.port)
intf.blocked = true
intf.links.core.switchTable.blockPeer(intf, intf.peer.port)
}
})
}
// reset the close timer
func (intf *linkInterface) notifyReading() {
func (intf *link) notifyReading() {
intf.Act(&intf.reader, func() {
if intf.closeTimer != nil {
intf.closeTimer.Stop()
@ -412,31 +470,29 @@ func (intf *linkInterface) notifyReading() {
}
// wake up the link if it was stalled, and (if size > 0) prepare to send keep-alive traffic
func (intf *linkInterface) notifyRead(size int) {
func (intf *link) notifyRead(size int) {
intf.Act(&intf.reader, func() {
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
}
intf.stalled = false
if !intf.unstalled {
intf._notifyIdle()
intf.unstalled = true
if size > 0 && intf.keepAliveTimer == nil {
intf.keepAliveTimer = time.AfterFunc(keepAliveTime, intf.notifyDoKeepAlive)
}
if size > 0 && intf.stallTimer == nil {
intf.stallTimer = time.AfterFunc(keepAliveTime, intf.notifyDoKeepAlive)
if intf.blocked {
intf.blocked = false
intf.links.core.switchTable.unblockPeer(intf, intf.peer.port)
}
intf.link.core.switchTable.unblockPeer(intf, intf.peer.port)
})
}
// We need to send keep-alive traffic now
func (intf *linkInterface) notifyDoKeepAlive() {
func (intf *link) notifyDoKeepAlive() {
intf.Act(nil, func() { // Sent from a time.AfterFunc
if intf.stallTimer != nil {
intf.stallTimer.Stop()
intf.stallTimer = nil
intf.writer.sendFrom(nil, [][]byte{nil}, true) // Empty keep-alive traffic
intf.writer.sendFrom(nil, [][]byte{nil}) // Empty keep-alive traffic
}
})
}
@ -445,18 +501,23 @@ func (intf *linkInterface) notifyDoKeepAlive() {
type linkWriter struct {
phony.Inbox
intf *linkInterface
intf *link
worker chan [][]byte
closed bool
}
func (w *linkWriter) sendFrom(from phony.Actor, bss [][]byte, isLinkTraffic bool) {
func (w *linkWriter) sendFrom(from phony.Actor, bss [][]byte) {
w.Act(from, func() {
if w.closed {
return
}
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)
w.intf.notifySending(size)
w.worker <- bss
w.intf.notifySent(size)
})
}
@ -464,7 +525,7 @@ func (w *linkWriter) sendFrom(from phony.Actor, bss [][]byte, isLinkTraffic bool
type linkReader struct {
phony.Inbox
intf *linkInterface
intf *link
err chan error
}

72
src/yggdrasil/packetqueue.go
View File

@ -1,12 +1,10 @@
package yggdrasil
import (
"math/rand"
"time"
)
// TODO take max size from config
const MAX_PACKET_QUEUE_SIZE = 4 * 1048576 // 4 MB
type pqStreamID string
type pqPacketInfo struct {
@ -25,46 +23,37 @@ type packetQueue struct {
size uint64
}
func (q *packetQueue) cleanup() {
for q.size > MAX_PACKET_QUEUE_SIZE {
// TODO? drop from a random stream
// odds proportional to size? bandwidth?
// always using the worst is exploitable -> flood 1 packet per random stream
// find the stream that's using the most bandwidth
now := time.Now()
var worst pqStreamID
for id := range q.streams {
worst = id
break // get a random ID to start
}
worstStream := q.streams[worst]
worstSize := float64(worstStream.size)
worstAge := now.Sub(worstStream.infos[0].time).Seconds()
for id, stream := range q.streams {
thisSize := float64(stream.size)
thisAge := now.Sub(stream.infos[0].time).Seconds()
// cross multiply to avoid division by zero issues
if worstSize*thisAge < thisSize*worstAge {
// worstSize/worstAge < thisSize/thisAge -> this uses more bandwidth
worst = id
worstStream = stream
worstSize = thisSize
worstAge = thisAge
}
}
// Drop the oldest packet from the worst stream
packet := worstStream.infos[0].packet
worstStream.infos = worstStream.infos[1:]
worstStream.size -= uint64(len(packet))
q.size -= uint64(len(packet))
pool_putBytes(packet)
// save the modified stream to queues
if len(worstStream.infos) > 0 {
q.streams[worst] = worstStream
} else {
delete(q.streams, worst)
// drop will remove a packet from the queue, returning it to the pool
// returns true if a packet was removed, false otherwise
func (q *packetQueue) drop() bool {
if q.size == 0 {
return false
}
// select a random stream, odds based on stream size
offset := rand.Uint64() % q.size
var worst pqStreamID
var size uint64
for id, stream := range q.streams {
worst = id
size += stream.size
if size >= offset {
break
}
}
// drop the oldest packet from the stream
worstStream := q.streams[worst]
packet := worstStream.infos[0].packet
worstStream.infos = worstStream.infos[1:]
worstStream.size -= uint64(len(packet))
q.size -= uint64(len(packet))
pool_putBytes(packet)
// save the modified stream to queues
if len(worstStream.infos) > 0 {
q.streams[worst] = worstStream
} else {
delete(q.streams, worst)
}
return true
}
func (q *packetQueue) push(packet []byte) {
@ -80,7 +69,6 @@ func (q *packetQueue) push(packet []byte) {
// save update to queues
q.streams[id] = stream
q.size += uint64(len(packet))
q.cleanup()
}
func (q *packetQueue) pop() ([]byte, bool) {

67
src/yggdrasil/peer.go
View File

@ -81,26 +81,25 @@ func (ps *peers) getAllowedEncryptionPublicKeys() []string {
type peer struct {
phony.Inbox
core *Core
intf *linkInterface
intf linkInterface
port switchPort
box crypto.BoxPubKey
sig crypto.SigPubKey
shared crypto.BoxSharedKey
linkShared crypto.BoxSharedKey
endpoint string
firstSeen time.Time // To track uptime for getPeers
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
close func() // Called when a peer is removed, to close the underlying connection, or via admin api
firstSeen time.Time // To track uptime for getPeers
dinfo *dhtInfo // used to keep the DHT working
// The below aren't actually useful internally, they're just gathered for getPeers statistics
bytesSent uint64
bytesRecvd uint64
ports map[switchPort]*peer
table *lookupTable
queue packetQueue
max uint64
seq uint64 // this and idle are used to detect when to drop packets from queue
idle bool
drop bool // set to true if we're dropping packets from the queue
}
func (ps *peers) updateTables(from phony.Actor, table *lookupTable) {
@ -123,19 +122,15 @@ func (ps *peers) _updatePeers() {
}
// Creates a new peer with the specified box, sig, and linkShared keys, using the lowest unoccupied port number.
func (ps *peers) _newPeer(box *crypto.BoxPubKey, sig *crypto.SigPubKey, linkShared *crypto.BoxSharedKey, intf *linkInterface, closer func(), out func([][]byte), linkOut func([]byte)) *peer {
func (ps *peers) _newPeer(box *crypto.BoxPubKey, sig *crypto.SigPubKey, linkShared *crypto.BoxSharedKey, intf linkInterface) *peer {
now := time.Now()
p := peer{box: *box,
core: ps.core,
intf: intf,
sig: *sig,
shared: *crypto.GetSharedKey(&ps.core.boxPriv, box),
linkShared: *linkShared,
firstSeen: now,
done: make(chan struct{}),
close: closer,
core: ps.core,
intf: intf,
out: out,
linkOut: linkOut,
}
oldPorts := ps.ports
newPorts := make(map[switchPort]*peer)
@ -172,10 +167,7 @@ func (ps *peers) _removePeer(p *peer) {
newPorts[k] = v
}
delete(newPorts, p.port)
if p.close != nil {
p.close()
}
close(p.done)
p.intf.close()
ps.ports = newPorts
ps._updatePeers()
}
@ -261,31 +253,36 @@ func (p *peer) _handleTraffic(packet []byte) {
coords := peer_getPacketCoords(packet)
next := p.table.lookup(coords)
if nPeer, isIn := p.ports[next]; isIn {
nPeer.sendPacketsFrom(p, [][]byte{packet})
nPeer.sendPacketFrom(p, packet)
}
//p.core.switchTable.packetInFrom(p, packet)
}
func (p *peer) sendPacketsFrom(from phony.Actor, packets [][]byte) {
func (p *peer) sendPacketFrom(from phony.Actor, packet []byte) {
p.Act(from, func() {
p._sendPackets(packets)
p._sendPacket(packet)
})
}
func (p *peer) _sendPackets(packets [][]byte) {
for _, packet := range packets {
p.queue.push(packet)
}
if p.idle {
func (p *peer) _sendPacket(packet []byte) {
p.queue.push(packet)
switch {
case p.idle:
p.idle = false
p._handleIdle()
case p.drop:
for p.queue.size > p.max {
p.queue.drop()
}
default:
p.intf.notifyQueued(p.seq)
}
}
func (p *peer) _handleIdle() {
var packets [][]byte
var size uint64
for size < 65535 {
for size < streamMsgSize {
if packet, success := p.queue.pop(); success {
packets = append(packets, packet)
size += uint64(len(packet))
@ -294,13 +291,25 @@ func (p *peer) _handleIdle() {
}
}
if len(packets) > 0 {
p.seq++
p.bytesSent += uint64(size)
p.out(packets)
p.intf.out(packets)
p.max = p.queue.size
} else {
p.idle = true
p.drop = false
}
}
func (p *peer) dropFromQueue(from phony.Actor, seq uint64) {
p.Act(from, func() {
if seq == p.seq {
p.drop = true
p.max = p.queue.size + streamMsgSize
}
})
}
// 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) {
@ -316,7 +325,7 @@ func (p *peer) _sendLinkPacket(packet []byte) {
Payload: bs,
}
packet = linkPacket.encode()
p.linkOut(packet)
p.intf.linkOut(packet)
}
// Decrypts the outer (permanent) and inner (ephemeral) crypto layers on link traffic.

68
src/yggdrasil/router.go
View File

@ -45,6 +45,8 @@ type router struct {
nodeinfo nodeinfo
searches searches
sessions sessions
intf routerInterface
peer *peer
table *lookupTable // has a copy of our locator
}
@ -53,28 +55,15 @@ func (r *router) init(core *Core) {
r.core = core
r.addr = *address.AddrForNodeID(&r.dht.nodeID)
r.subnet = *address.SubnetForNodeID(&r.dht.nodeID)
self := linkInterface{
name: "(self)",
info: linkInfo{
local: "(self)",
remote: "(self)",
linkType: "self",
},
}
var p *peer
peerOut := func(packets [][]byte) {
r.handlePackets(p, packets)
r.Act(p, func() {
// after the router handle the packets, notify the peer that it's ready for more
p.Act(r, p._handleIdle)
})
}
r.intf.router = r
phony.Block(&r.core.peers, func() {
// FIXME don't block here!
p = r.core.peers._newPeer(&r.core.boxPub, &r.core.sigPub, &crypto.BoxSharedKey{}, &self, nil, peerOut, nil)
r.peer = r.core.peers._newPeer(&r.core.boxPub, &r.core.sigPub, &crypto.BoxSharedKey{}, &r.intf)
})
p.Act(r, p._handleIdle)
r.out = func(bs []byte) { p.handlePacketFrom(r, bs) }
r.peer.Act(r, r.peer._handleIdle)
r.out = func(bs []byte) {
r.peer.handlePacketFrom(r, bs)
}
r.nodeinfo.init(r.core)
r.core.config.Mutex.RLock()
r.nodeinfo.setNodeInfo(r.core.config.Current.NodeInfo, r.core.config.Current.NodeInfoPrivacy)
@ -123,15 +112,6 @@ func (r *router) start() error {
return nil
}
// In practice, the switch will call this with 1 packet
func (r *router) handlePackets(from phony.Actor, packets [][]byte) {
r.Act(from, func() {
for _, packet := range packets {
r._handlePacket(packet)
}
})
}
// Insert a peer info into the dht, TODO? make the dht a separate actor
func (r *router) insertPeer(from phony.Actor, info *dhtInfo) {
r.Act(from, func() {
@ -275,3 +255,35 @@ func (r *router) _handleNodeInfo(bs []byte, fromKey *crypto.BoxPubKey) {
req.SendPermPub = *fromKey
r.nodeinfo.handleNodeInfo(r, &req)
}
////////////////////////////////////////////////////////////////////////////////
// routerInterface is a helper that implements linkInterface
type routerInterface struct {
router *router
}
func (intf *routerInterface) out(bss [][]byte) {
// Note that this is run in the peer's goroutine
intf.router.Act(intf.router.peer, func() {
for _, bs := range bss {
intf.router._handlePacket(bs)
}
})
//intf.router.peer.Act(nil, intf.router.peer._handleIdle)
intf.router.peer._handleIdle()
}
func (intf *routerInterface) linkOut(_ []byte) {}
func (intf *routerInterface) notifyQueued(seq uint64) {}
func (intf *routerInterface) close() {}
func (intf *routerInterface) name() string { return "(self)" }
func (intf *routerInterface) local() string { return "(self)" }
func (intf *routerInterface) remote() string { return "(self)" }
func (intf *routerInterface) interfaceType() string { return "self" }

4
src/yggdrasil/simlink.go
View File

@ -9,7 +9,7 @@ type Simlink struct {
phony.Inbox
rch chan []byte
dest *Simlink
link *linkInterface
link *link
started bool
}
@ -58,7 +58,7 @@ func (c *Core) NewSimlink() *Simlink {
s := &Simlink{rch: make(chan []byte, 1)}
n := "Simlink"
var err error
s.link, err = c.link.create(s, n, n, n, n, false, true)
s.link, err = c.links.create(s, n, n, n, n, false, true, linkOptions{})
if err != nil {
panic(err)
}

2
src/yggdrasil/stream.go
View File

@ -9,7 +9,7 @@ import (
)
// Test that this matches the interface we expect
var _ = linkInterfaceMsgIO(&stream{})
var _ = linkMsgIO(&stream{})
type stream struct {
rwc io.ReadWriteCloser

2
src/yggdrasil/switch.go
View File

@ -188,7 +188,7 @@ func (t *switchTable) init(core *Core) {
func (t *switchTable) reconfigure() {
// This is where reconfiguration would go, if we had anything useful to do.
t.core.link.reconfigure()
t.core.links.reconfigure()
t.core.peers.reconfigure()
}

50
src/yggdrasil/tcp.go
View File

@ -33,7 +33,7 @@ const tcp_ping_interval = (default_timeout * 2 / 3)
// The TCP listener and information about active TCP connections, to avoid duplication.
type tcp struct {
link *link
links *links
waitgroup sync.WaitGroup
mutex sync.Mutex // Protecting the below
listeners map[string]*TcpListener
@ -94,8 +94,8 @@ func (t *tcp) getAddr() *net.TCPAddr {
}
// Initializes the struct.
func (t *tcp) init(l *link) error {
t.link = l
func (t *tcp) init(l *links) error {
t.links = l
t.tls.init(t)
t.mutex.Lock()
t.calls = make(map[string]struct{})
@ -103,9 +103,9 @@ func (t *tcp) init(l *link) error {
t.listeners = make(map[string]*TcpListener)
t.mutex.Unlock()
t.link.core.config.Mutex.RLock()
defer t.link.core.config.Mutex.RUnlock()
for _, listenaddr := range t.link.core.config.Current.Listen {
t.links.core.config.Mutex.RLock()
defer t.links.core.config.Mutex.RUnlock()
for _, listenaddr := range t.links.core.config.Current.Listen {
switch listenaddr[:6] {
case "tcp://":
if _, err := t.listen(listenaddr[6:], nil); err != nil {
@ -116,7 +116,7 @@ func (t *tcp) init(l *link) error {
return err
}
default:
t.link.core.log.Errorln("Failed to add listener: listener", listenaddr, "is not correctly formatted, ignoring")
t.links.core.log.Errorln("Failed to add listener: listener", listenaddr, "is not correctly formatted, ignoring")
}
}
@ -134,35 +134,35 @@ func (t *tcp) stop() error {
}
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)
t.link.core.config.Mutex.RUnlock()
t.links.core.config.Mutex.RLock()
added := util.Difference(t.links.core.config.Current.Listen, t.links.core.config.Previous.Listen)
deleted := util.Difference(t.links.core.config.Previous.Listen, t.links.core.config.Current.Listen)
t.links.core.config.Mutex.RUnlock()
if len(added) > 0 || len(deleted) > 0 {
for _, a := range added {
switch a[:6] {
case "tcp://":
if _, err := t.listen(a[6:], nil); err != nil {
t.link.core.log.Errorln("Error adding TCP", a[6:], "listener:", err)
t.links.core.log.Errorln("Error adding TCP", a[6:], "listener:", err)
}
case "tls://":
if _, err := t.listen(a[6:], t.tls.forListener); err != nil {
t.link.core.log.Errorln("Error adding TLS", a[6:], "listener:", err)
t.links.core.log.Errorln("Error adding TLS", a[6:], "listener:", err)
}
default:
t.link.core.log.Errorln("Failed to add listener: listener", a, "is not correctly formatted, ignoring")
t.links.core.log.Errorln("Failed to add listener: listener", a, "is not correctly formatted, ignoring")
}
}
for _, d := range deleted {
if d[:6] != "tcp://" && d[:6] != "tls://" {
t.link.core.log.Errorln("Failed to delete listener: listener", d, "is not correctly formatted, ignoring")
t.links.core.log.Errorln("Failed to delete listener: listener", d, "is not correctly formatted, ignoring")
continue
}
t.mutex.Lock()
if listener, ok := t.listeners[d[6:]]; ok {
t.mutex.Unlock()
listener.Stop()
t.link.core.log.Infoln("Stopped TCP listener:", d[6:])
t.links.core.log.Infoln("Stopped TCP listener:", d[6:])
} else {
t.mutex.Unlock()
}
@ -210,13 +210,13 @@ func (t *tcp) listener(l *TcpListener, listenaddr string) {
}
// And here we go!
defer func() {
t.link.core.log.Infoln("Stopping TCP listener on:", l.Listener.Addr().String())
t.links.core.log.Infoln("Stopping TCP listener on:", l.Listener.Addr().String())
l.Listener.Close()
t.mutex.Lock()
delete(t.listeners, listenaddr)
t.mutex.Unlock()
}()
t.link.core.log.Infoln("Listening for TCP on:", l.Listener.Addr().String())
t.links.core.log.Infoln("Listening for TCP on:", l.Listener.Addr().String())
go func() {
<-l.stop
l.Listener.Close()
@ -225,7 +225,7 @@ func (t *tcp) listener(l *TcpListener, listenaddr string) {
for {
sock, err := l.Listener.Accept()
if err != nil {
t.link.core.log.Errorln("Failed to accept connection:", err)
t.links.core.log.Errorln("Failed to accept connection:", err)
return
}
t.waitgroup.Add(1)
@ -355,7 +355,7 @@ func (t *tcp) call(saddr string, options tcpOptions, sintf string) {
}
conn, err = dialer.Dial("tcp", dst.String())
if err != nil {
t.link.core.log.Debugf("Failed to dial %s: %s", callproto, err)
t.links.core.log.Debugf("Failed to dial %s: %s", callproto, err)
return
}
t.waitgroup.Add(1)
@ -372,7 +372,7 @@ func (t *tcp) handler(sock net.Conn, incoming bool, options tcpOptions) {
if options.upgrade != nil {
var err error
if sock, err = options.upgrade.upgrade(sock); err != nil {
t.link.core.log.Errorln("TCP handler upgrade failed:", err)
t.links.core.log.Errorln("TCP handler upgrade failed:", err)
return
} else {
upgraded = true
@ -398,12 +398,12 @@ func (t *tcp) handler(sock net.Conn, incoming bool, options tcpOptions) {
remote, _, _ = net.SplitHostPort(sock.RemoteAddr().String())
}
force := net.ParseIP(strings.Split(remote, "%")[0]).IsLinkLocalUnicast()
link, err := t.link.core.link.create(&stream, name, proto, local, remote, incoming, force, options.linkOptions)
link, err := t.links.create(&stream, name, proto, local, remote, incoming, force, options.linkOptions)
if err != nil {
t.link.core.log.Println(err)
t.links.core.log.Println(err)
panic(err)
}
t.link.core.log.Debugln("DEBUG: starting handler for", name)
t.links.core.log.Debugln("DEBUG: starting handler for", name)
err = link.handler()
t.link.core.log.Debugln("DEBUG: stopped handler for", name, err)
t.links.core.log.Debugln("DEBUG: stopped handler for", name, err)
}

6
src/yggdrasil/tcp_linux.go
View File

@ -20,10 +20,10 @@ func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
// Log any errors
if bbr != nil {
t.link.core.log.Debugln("Failed to set tcp_congestion_control to bbr for socket, SetsockoptString error:", bbr)
t.links.core.log.Debugln("Failed to set tcp_congestion_control to bbr for socket, SetsockoptString error:", bbr)
}
if control != nil {
t.link.core.log.Debugln("Failed to set tcp_congestion_control to bbr for socket, Control error:", control)
t.links.core.log.Debugln("Failed to set tcp_congestion_control to bbr for socket, Control error:", control)
}
// Return nil because errors here are not considered fatal for the connection, it just means congestion control is suboptimal
@ -38,7 +38,7 @@ func (t *tcp) getControl(sintf string) func(string, string, syscall.RawConn) err
}
c.Control(btd)
if err != nil {
t.link.core.log.Debugln("Failed to set SO_BINDTODEVICE:", sintf)
t.links.core.log.Debugln("Failed to set SO_BINDTODEVICE:", sintf)
}
return t.tcpContext(network, address, c)
}

4
src/yggdrasil/tls.go
View File

@ -34,7 +34,7 @@ func (t *tcptls) init(tcp *tcp) {
}
edpriv := make(ed25519.PrivateKey, ed25519.PrivateKeySize)
copy(edpriv[:], tcp.link.core.sigPriv[:])
copy(edpriv[:], tcp.links.core.sigPriv[:])
certBuf := &bytes.Buffer{}
@ -42,7 +42,7 @@ func (t *tcptls) init(tcp *tcp) {
pubtemp := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: hex.EncodeToString(tcp.link.core.sigPub[:]),
CommonName: hex.EncodeToString(tcp.links.core.sigPub[:]),
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 365),