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Fix: tunnel UDP race condition (#1043)

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This commit is contained in:
Jason Lyu 2020-10-28 21:26:50 +08:00 committed by GitHub
parent ba060bd0ee
commit 2cd1b890ce
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 52 additions and 44 deletions
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6
component/nat/table.go
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@ -22,9 +22,9 @@ func (t *Table) Get(key string) C.PacketConn {
return item.(C.PacketConn)
}
func (t *Table) GetOrCreateLock(key string) (*sync.WaitGroup, bool) {
item, loaded := t.mapping.LoadOrStore(key, &sync.WaitGroup{})
return item.(*sync.WaitGroup), loaded
func (t *Table) GetOrCreateLock(key string) (*sync.Cond, bool) {
item, loaded := t.mapping.LoadOrStore(key, sync.NewCond(&sync.Mutex{}))
return item.(*sync.Cond), loaded
}
func (t *Table) Delete(key string) {

44
tunnel/tunnel.go
View file

@ -164,7 +164,7 @@ func handleUDPConn(packet *inbound.PacketAdapter) {
return
}
// make a fAddr if requset ip is fakeip
// make a fAddr if request ip is fakeip
var fAddr net.Addr
if resolver.IsExistFakeIP(metadata.DstIP) {
fAddr = metadata.UDPAddr()
@ -176,34 +176,49 @@ func handleUDPConn(packet *inbound.PacketAdapter) {
}
key := packet.LocalAddr().String()
handle := func() bool {
pc := natTable.Get(key)
if pc != nil {
handleUDPToRemote(packet, pc, metadata)
return true
}
return false
}
if handle() {
return
}
lockKey := key + "-lock"
wg, loaded := natTable.GetOrCreateLock(lockKey)
cond, loaded := natTable.GetOrCreateLock(lockKey)
go func() {
if !loaded {
wg.Add(1)
if loaded {
cond.L.Lock()
cond.Wait()
handle()
cond.L.Unlock()
return
}
defer func() {
natTable.Delete(lockKey)
cond.Broadcast()
}()
proxy, rule, err := resolveMetadata(metadata)
if err != nil {
log.Warnln("[UDP] Parse metadata failed: %s", err.Error())
natTable.Delete(lockKey)
wg.Done()
return
}
rawPc, err := proxy.DialUDP(metadata)
if err != nil {
log.Warnln("[UDP] dial %s error: %s", proxy.Name(), err.Error())
natTable.Delete(lockKey)
wg.Done()
return
}
pc = newUDPTracker(rawPc, DefaultManager, metadata, rule)
pc := newUDPTracker(rawPc, DefaultManager, metadata, rule)
switch true {
case rule != nil:
@ -216,17 +231,10 @@ func handleUDPConn(packet *inbound.PacketAdapter) {
log.Infoln("[UDP] %s --> %v doesn't match any rule using DIRECT", metadata.SourceAddress(), metadata.String())
}
natTable.Set(key, pc)
natTable.Delete(lockKey)
wg.Done()
go handleUDPToLocal(packet.UDPPacket, pc, key, fAddr)
}
wg.Wait()
pc := natTable.Get(key)
if pc != nil {
handleUDPToRemote(packet, pc, metadata)
}
natTable.Set(key, pc)
handle()
}()
}