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@ -264,7 +264,7 @@ type Conn struct {
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// stunReceiveFunc holds the current STUN packet processing func.
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// stunReceiveFunc holds the current STUN packet processing func.
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// Its Loaded value is always non-nil.
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// Its Loaded value is always non-nil.
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stunReceiveFunc atomic.Value // of func(p []byte, fromAddr *net.UDPAddr)
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stunReceiveFunc syncs.AtomicValue[func(p []byte, fromAddr netip.AddrPort)]
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// derpRecvCh is used by receiveDERP to read DERP messages.
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// derpRecvCh is used by receiveDERP to read DERP messages.
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// It must have buffer size > 0; see issue 3736.
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// It must have buffer size > 0; see issue 3736.
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@ -300,7 +300,7 @@ type Conn struct {
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// havePrivateKey is whether privateKey is non-zero.
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// havePrivateKey is whether privateKey is non-zero.
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havePrivateKey atomic.Bool
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havePrivateKey atomic.Bool
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publicKeyAtomic atomic.Value // of key.NodePublic (or NodeKey zero value if !havePrivateKey)
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publicKeyAtomic syncs.AtomicValue[key.NodePublic] // or NodeKey zero value if !havePrivateKey
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// derpMapAtomic is the same as derpMap, but without requiring
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// derpMapAtomic is the same as derpMap, but without requiring
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// sync.Mutex. For use with NewRegionClient's callback, to avoid
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// sync.Mutex. For use with NewRegionClient's callback, to avoid
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@ -1668,7 +1668,7 @@ func (c *Conn) receiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
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// caller).
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// caller).
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func (c *Conn) receiveIP(b []byte, ipp netip.AddrPort, cache *ippEndpointCache) (ep *endpoint, ok bool) {
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func (c *Conn) receiveIP(b []byte, ipp netip.AddrPort, cache *ippEndpointCache) (ep *endpoint, ok bool) {
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if stun.Is(b) {
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if stun.Is(b) {
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c.stunReceiveFunc.Load().(func([]byte, netip.AddrPort))(b, ipp)
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c.stunReceiveFunc.Load()(b, ipp)
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return nil, false
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return nil, false
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}
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}
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if c.handleDiscoMessage(b, ipp, key.NodePublic{}) {
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if c.handleDiscoMessage(b, ipp, key.NodePublic{}) {
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@ -2979,10 +2979,8 @@ type RebindingUDPConn struct {
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// check pconn (after acquiring mu) to see if there's been a rebind
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// check pconn (after acquiring mu) to see if there's been a rebind
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// meanwhile.
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// meanwhile.
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// pconn isn't really needed, but makes some of the code simpler
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// pconn isn't really needed, but makes some of the code simpler
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// to keep it in a type safe form. TODO(bradfitz): really we should make a generic
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// to keep it in a type safe form.
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// atomic.Value. Unfortunately Go 1.19's atomic.Pointer[T] is only for pointers,
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pconnAtomic syncs.AtomicValue[nettype.PacketConn]
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// not interfaces.
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pconnAtomic atomic.Value // of nettype.PacketConn
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mu sync.Mutex // held while changing pconn (and pconnAtomic)
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mu sync.Mutex // held while changing pconn (and pconnAtomic)
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pconn nettype.PacketConn
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pconn nettype.PacketConn
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@ -3004,7 +3002,7 @@ func (c *RebindingUDPConn) currentConn() nettype.PacketConn {
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// It returns the number of bytes copied and the source address.
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// It returns the number of bytes copied and the source address.
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func (c *RebindingUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
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func (c *RebindingUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
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for {
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for {
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pconn := c.pconnAtomic.Load().(nettype.PacketConn)
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pconn := c.pconnAtomic.Load()
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n, addr, err := pconn.ReadFrom(b)
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n, addr, err := pconn.ReadFrom(b)
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if err != nil && pconn != c.currentConn() {
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if err != nil && pconn != c.currentConn() {
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continue
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continue
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@ -3022,7 +3020,7 @@ func (c *RebindingUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
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// when c's underlying connection is a net.UDPConn.
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// when c's underlying connection is a net.UDPConn.
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func (c *RebindingUDPConn) ReadFromNetaddr(b []byte) (n int, ipp netip.AddrPort, err error) {
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func (c *RebindingUDPConn) ReadFromNetaddr(b []byte) (n int, ipp netip.AddrPort, err error) {
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for {
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for {
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pconn := c.pconnAtomic.Load().(nettype.PacketConn)
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pconn := c.pconnAtomic.Load()
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// Optimization: Treat *net.UDPConn specially.
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// Optimization: Treat *net.UDPConn specially.
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// This lets us avoid allocations by calling ReadFromUDPAddrPort.
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// This lets us avoid allocations by calling ReadFromUDPAddrPort.
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@ -3081,7 +3079,7 @@ func (c *RebindingUDPConn) closeLocked() error {
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func (c *RebindingUDPConn) WriteTo(b []byte, addr net.Addr) (int, error) {
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func (c *RebindingUDPConn) WriteTo(b []byte, addr net.Addr) (int, error) {
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for {
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for {
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pconn := c.pconnAtomic.Load().(nettype.PacketConn)
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pconn := c.pconnAtomic.Load()
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n, err := pconn.WriteTo(b, addr)
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n, err := pconn.WriteTo(b, addr)
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if err != nil {
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if err != nil {
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@ -3095,7 +3093,7 @@ func (c *RebindingUDPConn) WriteTo(b []byte, addr net.Addr) (int, error) {
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func (c *RebindingUDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
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func (c *RebindingUDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
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for {
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for {
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pconn := c.pconnAtomic.Load().(nettype.PacketConn)
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pconn := c.pconnAtomic.Load()
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n, err := pconn.WriteToUDPAddrPort(b, addr)
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n, err := pconn.WriteToUDPAddrPort(b, addr)
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if err != nil {
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if err != nil {
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@ -3643,10 +3641,9 @@ func (de *endpoint) removeSentPingLocked(txid stun.TxID, sp sentPing) {
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// The caller should use de.discoKey as the discoKey argument.
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// The caller should use de.discoKey as the discoKey argument.
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// It is passed in so that sendDiscoPing doesn't need to lock de.mu.
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// It is passed in so that sendDiscoPing doesn't need to lock de.mu.
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func (de *endpoint) sendDiscoPing(ep netip.AddrPort, discoKey key.DiscoPublic, txid stun.TxID, logLevel discoLogLevel) {
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func (de *endpoint) sendDiscoPing(ep netip.AddrPort, discoKey key.DiscoPublic, txid stun.TxID, logLevel discoLogLevel) {
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selfPubKey, _ := de.c.publicKeyAtomic.Load().(key.NodePublic)
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sent, _ := de.c.sendDiscoMessage(ep, de.publicKey, discoKey, &disco.Ping{
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sent, _ := de.c.sendDiscoMessage(ep, de.publicKey, discoKey, &disco.Ping{
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TxID: [12]byte(txid),
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TxID: [12]byte(txid),
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NodeKey: selfPubKey,
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NodeKey: de.c.publicKeyAtomic.Load(),
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}, logLevel)
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}, logLevel)
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if !sent {
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if !sent {
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de.forgetPing(txid)
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de.forgetPing(txid)
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Maisem Ali
2 years ago
committed by