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use a session worker to try to avoid mutex hell. compiles, but incomplete and doesn't work yet

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This commit is contained in:
Arceliar 2019-04-21 20:38:14 -05:00
parent 0b8f5b5dda
commit 5dada3952c
4 changed files with 191 additions and 151 deletions
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162
src/yggdrasil/conn.go
View File

@ -4,7 +4,6 @@ import (
"errors"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
@ -15,10 +14,11 @@ type Conn struct {
core *Core
nodeID *crypto.NodeID
nodeMask *crypto.NodeID
session *sessionInfo
recv chan *wire_trafficPacket // Eventually gets attached to session.recv
mutex *sync.RWMutex
readDeadline time.Time
writeDeadline time.Time
session *sessionInfo
readDeadline time.Time // TODO timer
writeDeadline time.Time // TODO timer
expired bool
}
@ -39,6 +39,7 @@ func (c *Conn) startSearch() {
if sinfo != nil {
c.mutex.Lock()
c.session = sinfo
c.session.recv = c.recv
c.nodeID, c.nodeMask = sinfo.theirAddr.GetNodeIDandMask()
c.mutex.Unlock()
}
@ -50,113 +51,124 @@ func (c *Conn) startSearch() {
}
c.core.searches.continueSearch(sinfo)
}
switch {
case c.session == nil || !c.session.init.Load().(bool):
c.mutex.RLock()
defer c.mutex.RUnlock()
if c.session == nil {
doSearch()
case time.Since(c.session.time.Load().(time.Time)) > 6*time.Second:
sTime := c.session.time.Load().(time.Time)
pingTime := c.session.pingTime.Load().(time.Time)
if sTime.Before(pingTime) && time.Since(pingTime) > 6*time.Second {
doSearch()
} else {
pingSend := c.session.pingSend.Load().(time.Time)
now := time.Now()
if !sTime.Before(pingTime) {
c.session.pingTime.Store(now)
}
if time.Since(pingSend) > time.Second {
c.session.pingSend.Store(now)
c.core.sessions.sendPingPong(c.session, false)
} else {
sinfo := c.session // In case c.session is somehow changed meanwhile
sinfo.worker <- func() {
switch {
case !sinfo.init:
doSearch()
case time.Since(sinfo.time) > 6*time.Second:
if sinfo.time.Before(sinfo.pingTime) && time.Since(sinfo.pingTime) > 6*time.Second {
// TODO double check that the above condition is correct
doSearch()
} else {
c.core.sessions.ping(sinfo)
}
default: // Don't do anything, to keep traffic throttled
}
}
}
}
func (c *Conn) Read(b []byte) (int, error) {
c.mutex.RLock()
defer c.mutex.RUnlock()
if c.expired {
return 0, errors.New("session is closed")
}
if c.session == nil {
return 0, errors.New("searching for remote side")
}
if init, ok := c.session.init.Load().(bool); !ok || (ok && !init) {
return 0, errors.New("waiting for remote side to accept " + c.String())
err := func() error {
c.mutex.RLock()
defer c.mutex.RUnlock()
if c.expired {
return errors.New("session is closed")
}
return nil
}()
if err != nil {
return 0, err
}
select {
case p, ok := <-c.session.recv:
// TODO...
case p, ok := <-c.recv:
if !ok {
c.mutex.Lock()
c.expired = true
c.mutex.Unlock()
return 0, errors.New("session is closed")
}
defer util.PutBytes(p.Payload)
err := func() error {
c.session.theirNonceMutex.Lock()
defer c.session.theirNonceMutex.Unlock()
if !c.session.nonceIsOK(&p.Nonce) {
return errors.New("packet dropped due to invalid nonce")
c.mutex.RLock()
sinfo := c.session
c.mutex.RUnlock()
var err error
sinfo.doWorker(func() {
if !sinfo.nonceIsOK(&p.Nonce) {
err = errors.New("packet dropped due to invalid nonce")
return
}
bs, isOK := crypto.BoxOpen(&c.session.sharedSesKey, p.Payload, &p.Nonce)
bs, isOK := crypto.BoxOpen(&sinfo.sharedSesKey, p.Payload, &p.Nonce)
if !isOK {
util.PutBytes(bs)
return errors.New("packet dropped due to decryption failure")
err = errors.New("packet dropped due to decryption failure")
return
}
copy(b, bs)
if len(bs) < len(b) {
b = b[:len(bs)]
}
c.session.updateNonce(&p.Nonce)
c.session.time.Store(time.Now())
return nil
}()
sinfo.updateNonce(&p.Nonce)
sinfo.time = time.Now()
sinfo.bytesRecvd += uint64(len(b))
})
if err != nil {
return 0, err
}
atomic.AddUint64(&c.session.bytesRecvd, uint64(len(b)))
return len(b), nil
case <-c.session.closed:
c.expired = true
return len(b), errors.New("session is closed")
//case <-c.recvTimeout:
//case <-c.session.closed:
// c.expired = true
// return len(b), errors.New("session is closed")
}
}
func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
c.mutex.RLock()
defer c.mutex.RUnlock()
if c.expired {
return 0, errors.New("session is closed")
var sinfo *sessionInfo
err = func() error {
c.mutex.RLock()
defer c.mutex.RUnlock()
if c.expired {
return errors.New("session is closed")
}
sinfo = c.session
return nil
}()
if err != nil {
return 0, err
}
if c.session == nil {
if sinfo == nil {
c.core.router.doAdmin(func() {
c.startSearch()
})
return 0, errors.New("searching for remote side")
}
defer util.PutBytes(b)
if init, ok := c.session.init.Load().(bool); !ok || (ok && !init) {
return 0, errors.New("waiting for remote side to accept " + c.String())
}
coords := c.session.coords
c.session.myNonceMutex.Lock()
payload, nonce := crypto.BoxSeal(&c.session.sharedSesKey, b, &c.session.myNonce)
defer util.PutBytes(payload)
p := wire_trafficPacket{
Coords: coords,
Handle: c.session.theirHandle,
Nonce: *nonce,
Payload: payload,
}
packet := p.encode()
c.session.myNonceMutex.Unlock()
atomic.AddUint64(&c.session.bytesSent, uint64(len(b)))
select {
case c.session.send <- packet:
case <-c.session.closed:
c.expired = true
return len(b), errors.New("session is closed")
}
c.session.core.router.out(packet)
//defer util.PutBytes(b)
var packet []byte
sinfo.doWorker(func() {
if !sinfo.init {
err = errors.New("waiting for remote side to accept " + c.String())
return
}
payload, nonce := crypto.BoxSeal(&sinfo.sharedSesKey, b, &sinfo.myNonce)
defer util.PutBytes(payload)
p := wire_trafficPacket{
Coords: sinfo.coords,
Handle: sinfo.theirHandle,
Nonce: *nonce,
Payload: payload,
}
packet = p.encode()
sinfo.bytesSent += uint64(len(b))
})
sinfo.core.router.out(packet)
return len(b), nil
}

1
src/yggdrasil/dialer.go
View File

@ -63,6 +63,7 @@ func (d *Dialer) DialByNodeIDandMask(nodeID, nodeMask *crypto.NodeID) (Conn, err
mutex: &sync.RWMutex{},
nodeID: nodeID,
nodeMask: nodeMask,
recv: make(chan *wire_trafficPacket, 32),
}
conn.core.router.doAdmin(func() {
conn.startSearch()

34
src/yggdrasil/router.go
View File

@ -23,7 +23,7 @@ package yggdrasil
// The router then runs some sanity checks before passing it to the adapter
import (
"bytes"
//"bytes"
"time"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
@ -42,12 +42,12 @@ type router struct {
out func([]byte) // packets we're sending to the network, link to peer's "in"
toRecv chan router_recvPacket // packets to handle via recvPacket()
recv chan<- []byte // place where the adapter pulls received packets from
send <-chan []byte // place where the adapter puts outgoing packets
reject chan<- RejectedPacket // place where we send error packets back to adapter
reset chan struct{} // signal that coords changed (re-init sessions/dht)
admin chan func() // pass a lambda for the admin socket to query stuff
cryptokey cryptokey
nodeinfo nodeinfo
//send <-chan []byte // place where the adapter puts outgoing packets
reject chan<- RejectedPacket // place where we send error packets back to adapter
reset chan struct{} // signal that coords changed (re-init sessions/dht)
admin chan func() // pass a lambda for the admin socket to query stuff
cryptokey cryptokey
nodeinfo nodeinfo
}
// Packet and session info, used to check that the packet matches a valid IP range or CKR prefix before sending to the adapter.
@ -122,11 +122,11 @@ func (r *router) init(core *Core) {
}()
r.out = func(packet []byte) { out2 <- packet }
r.toRecv = make(chan router_recvPacket, 32)
recv := make(chan []byte, 32)
send := make(chan []byte, 32)
//recv := make(chan []byte, 32)
//send := make(chan []byte, 32)
reject := make(chan RejectedPacket, 32)
r.recv = recv
r.send = send
//r.recv = recv
//r.send = send
r.reject = reject
r.reset = make(chan struct{}, 1)
r.admin = make(chan func(), 32)
@ -157,8 +157,8 @@ func (r *router) mainLoop() {
r.recvPacket(rp.bs, rp.sinfo)
case p := <-r.in:
r.handleIn(p)
case p := <-r.send:
r.sendPacket(p)
//case p := <-r.send:
// r.sendPacket(p)
case info := <-r.core.dht.peers:
r.core.dht.insertPeer(info)
case <-r.reset:
@ -181,6 +181,7 @@ func (r *router) mainLoop() {
}
}
/*
// Checks a packet's to/from address to make sure it's in the allowed range.
// If a session to the destination exists, gets the session and passes the packet to it.
// If no session exists, it triggers (or continues) a search.
@ -353,6 +354,7 @@ func (r *router) sendPacket(bs []byte) {
sinfo.send <- bs
}
}
*/
// Called for incoming traffic by the session worker for that connection.
// Checks that the IP address is correct (matches the session) and passes the packet to the adapter.
@ -429,7 +431,11 @@ func (r *router) handleTraffic(packet []byte) {
if !isIn {
return
}
sinfo.recv <- &p
select {
case sinfo.recv <- &p: // FIXME ideally this should be FIFO
default:
util.PutBytes(p.Payload)
}
}
// Handles protocol traffic by decrypting it, checking its type, and passing it to the appropriate handler for that traffic type.

145
src/yggdrasil/session.go
View File

@ -18,38 +18,50 @@ import (
// All the information we know about an active session.
// This includes coords, permanent and ephemeral keys, handles and nonces, various sorts of timing information for timeout and maintenance, and some metadata for the admin API.
type sessionInfo struct {
core *Core //
reconfigure chan chan error //
theirAddr address.Address //
theirSubnet address.Subnet //
theirPermPub crypto.BoxPubKey //
theirSesPub crypto.BoxPubKey //
mySesPub crypto.BoxPubKey //
mySesPriv crypto.BoxPrivKey //
sharedSesKey crypto.BoxSharedKey // derived from session keys
theirHandle crypto.Handle //
myHandle crypto.Handle //
theirNonce crypto.BoxNonce //
theirNonceMask uint64 //
theirNonceMutex sync.Mutex // protects the above
myNonce crypto.BoxNonce //
myNonceMutex sync.Mutex // protects the above
theirMTU uint16 //
myMTU uint16 //
wasMTUFixed bool // Was the MTU fixed by a receive error?
time atomic.Value // time.Time // Time we last received a packet
mtuTime atomic.Value // time.Time // time myMTU was last changed
pingTime atomic.Value // time.Time // time the first ping was sent since the last received packet
pingSend atomic.Value // time.Time // time the last ping was sent
coords []byte // coords of destination
packet []byte // a buffered packet, sent immediately on ping/pong
init atomic.Value // bool // Reset if coords change
send chan []byte //
recv chan *wire_trafficPacket //
closed chan interface{} //
tstamp int64 // ATOMIC - tstamp from their last session ping, replay attack mitigation
bytesSent uint64 // Bytes of real traffic sent in this session
bytesRecvd uint64 // Bytes of real traffic received in this session
core *Core //
reconfigure chan chan error //
theirAddr address.Address //
theirSubnet address.Subnet //
theirPermPub crypto.BoxPubKey //
theirSesPub crypto.BoxPubKey //
mySesPub crypto.BoxPubKey //
mySesPriv crypto.BoxPrivKey //
sharedSesKey crypto.BoxSharedKey // derived from session keys
theirHandle crypto.Handle //
myHandle crypto.Handle //
theirNonce crypto.BoxNonce //
theirNonceMask uint64 //
myNonce crypto.BoxNonce //
theirMTU uint16 //
myMTU uint16 //
wasMTUFixed bool // Was the MTU fixed by a receive error?
time time.Time // Time we last received a packet
mtuTime time.Time // time myMTU was last changed
pingTime time.Time // time the first ping was sent since the last received packet
pingSend time.Time // time the last ping was sent
coords []byte // coords of destination
packet []byte // a buffered packet, sent immediately on ping/pong
init bool // Reset if coords change
tstamp int64 // ATOMIC - tstamp from their last session ping, replay attack mitigation
bytesSent uint64 // Bytes of real traffic sent in this session
bytesRecvd uint64 // Bytes of real traffic received in this session
worker chan func() // Channel to send work to the session worker
recv chan *wire_trafficPacket // Received packets go here, picked up by the associated Conn
}
func (sinfo *sessionInfo) doWorker(f func()) {
done := make(chan struct{})
sinfo.worker <- func() {
f()
close(done)
}
<-done
}
func (sinfo *sessionInfo) workerMain() {
for f := range sinfo.worker {
f()
}
}
// Represents a session ping/pong packet, andincludes information like public keys, a session handle, coords, a timestamp to prevent replays, and the tun/tap MTU.
@ -89,16 +101,19 @@ func (s *sessionInfo) update(p *sessionPing) bool {
// allocate enough space for additional coords
s.coords = append(make([]byte, 0, len(p.Coords)+11), p.Coords...)
}
now := time.Now()
s.time.Store(now)
atomic.StoreInt64(&s.tstamp, p.Tstamp)
s.init.Store(true)
s.time = time.Now()
s.tstamp = p.Tstamp
s.init = true
return true
}
// Returns true if the session has been idle for longer than the allowed timeout.
func (s *sessionInfo) timedout() bool {
return time.Since(s.time.Load().(time.Time)) > time.Minute
var timedout bool
s.doWorker(func() {
timedout = time.Since(s.time) > time.Minute
})
return timedout
}
// Struct of all active sessions.
@ -282,10 +297,10 @@ func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
sinfo.theirMTU = 1280
sinfo.myMTU = 1280
now := time.Now()
sinfo.time.Store(now)
sinfo.mtuTime.Store(now)
sinfo.pingTime.Store(now)
sinfo.pingSend.Store(now)
sinfo.time = now
sinfo.mtuTime = now
sinfo.pingTime = now
sinfo.pingSend = now
higher := false
for idx := range ss.core.boxPub {
if ss.core.boxPub[idx] > sinfo.theirPermPub[idx] {
@ -305,14 +320,13 @@ func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
sinfo.myHandle = *crypto.NewHandle()
sinfo.theirAddr = *address.AddrForNodeID(crypto.GetNodeID(&sinfo.theirPermPub))
sinfo.theirSubnet = *address.SubnetForNodeID(crypto.GetNodeID(&sinfo.theirPermPub))
sinfo.send = make(chan []byte, 32)
sinfo.recv = make(chan *wire_trafficPacket, 32)
sinfo.closed = make(chan interface{})
sinfo.worker = make(chan func(), 1)
ss.sinfos[sinfo.myHandle] = &sinfo
ss.byMySes[sinfo.mySesPub] = &sinfo.myHandle
ss.byTheirPerm[sinfo.theirPermPub] = &sinfo.myHandle
ss.addrToPerm[sinfo.theirAddr] = &sinfo.theirPermPub
ss.subnetToPerm[sinfo.theirSubnet] = &sinfo.theirPermPub
go sinfo.workerMain()
return &sinfo
}
@ -366,14 +380,12 @@ func (ss *sessions) cleanup() {
// Closes a session, removing it from sessions maps and killing the worker goroutine.
func (sinfo *sessionInfo) close() {
close(sinfo.closed)
delete(sinfo.core.sessions.sinfos, sinfo.myHandle)
delete(sinfo.core.sessions.byMySes, sinfo.mySesPub)
delete(sinfo.core.sessions.byTheirPerm, sinfo.theirPermPub)
delete(sinfo.core.sessions.addrToPerm, sinfo.theirAddr)
delete(sinfo.core.sessions.subnetToPerm, sinfo.theirSubnet)
close(sinfo.send)
close(sinfo.recv)
close(sinfo.worker)
}
// Returns a session ping appropriate for the given session info.
@ -436,7 +448,7 @@ func (ss *sessions) sendPingPong(sinfo *sessionInfo, isPong bool) {
packet := p.encode()
ss.core.router.out(packet)
if !isPong {
sinfo.pingSend.Store(time.Now())
sinfo.pingSend = time.Now()
}
}
@ -468,29 +480,36 @@ func (ss *sessions) handlePing(ping *sessionPing) {
mutex: &sync.RWMutex{},
nodeID: crypto.GetNodeID(&sinfo.theirPermPub),
nodeMask: &crypto.NodeID{},
recv: make(chan *wire_trafficPacket, 32),
}
for i := range conn.nodeMask {
conn.nodeMask[i] = 0xFF
}
sinfo.recv = conn.recv
ss.listener.conn <- conn
} else {
ss.core.log.Debugln("Received new session but there is no listener, ignoring")
}
ss.listenerMutex.Unlock()
}
// Update the session
if !sinfo.update(ping) { /*panic("Should not happen in testing")*/
return
}
if !ping.IsPong {
ss.sendPingPong(sinfo, true)
}
if sinfo.packet != nil {
// send
var bs []byte
bs, sinfo.packet = sinfo.packet, nil
ss.core.router.sendPacket(bs)
}
sinfo.doWorker(func() {
// Update the session
if !sinfo.update(ping) { /*panic("Should not happen in testing")*/
return
}
if !ping.IsPong {
ss.sendPingPong(sinfo, true)
}
if sinfo.packet != nil {
/* FIXME this needs to live in the net.Conn or something, needs work in Write
// send
var bs []byte
bs, sinfo.packet = sinfo.packet, nil
ss.core.router.sendPacket(bs) // FIXME this needs to live in the net.Conn or something, needs work in Write
*/
sinfo.packet = nil
}
})
}
// Get the MTU of the session.
@ -536,6 +555,8 @@ func (sinfo *sessionInfo) updateNonce(theirNonce *crypto.BoxNonce) {
// Called after coord changes, so attemtps to use a session will trigger a new ping and notify the remote end of the coord change.
func (ss *sessions) resetInits() {
for _, sinfo := range ss.sinfos {
sinfo.init.Store(false)
sinfo.doWorker(func() {
sinfo.init = false
})
}
}