fix: don't ignore bind6 error when udp's target is ipv6 address

component/dhcp/conn.go

@@ -3,6 +3,7 @@ package dhcp
 import (
 	"context"
 	"net"
+	"net/netip"
 	"runtime"
 
 	"github.com/metacubex/mihomo/component/dialer"
@@ -24,5 +25,5 @@ func ListenDHCPClient(ctx context.Context, ifaceName string) (net.PacketConn, er
 		options = append(options, dialer.WithFallbackBind(true))
 	}
 
-	return dialer.ListenPacket(ctx, "udp4", listenAddr, options...)
+	return dialer.ListenPacket(ctx, "udp4", listenAddr, netip.AddrPortFrom(netip.AddrFrom4([4]byte{255, 255, 255, 255}), 67), options...)
 }

component/dialer/bind.go

@@ -75,7 +75,7 @@ func fallbackBindIfaceToDialer(ifaceName string, dialer *net.Dialer, network str
 	return nil
 }
 
-func fallbackBindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, address string) (string, error) {
+func fallbackBindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, address string, rAddrPort netip.AddrPort) (string, error) {
 	_, port, err := net.SplitHostPort(address)
 	if err != nil {
 		port = "0"

component/dialer/bind_darwin.go

@@ -46,7 +46,7 @@ func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.A
 	return nil
 }
 
-func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
+func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string, rAddrPort netip.AddrPort) (string, error) {
 	ifaceObj, err := iface.ResolveInterface(ifaceName)
 	if err != nil {
 		return "", err

component/dialer/bind_linux.go

@@ -35,7 +35,7 @@ func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.A
 	return nil
 }
 
-func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
+func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string, rAddrPort netip.AddrPort) (string, error) {
 	addControlToListenConfig(lc, bindControl(ifaceName))
 
 	return address, nil

component/dialer/bind_others.go

@@ -11,8 +11,8 @@ func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, network string, des
 	return fallbackBindIfaceToDialer(ifaceName, dialer, network, destination)
 }
 
-func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, network, address string) (string, error) {
-	return fallbackBindIfaceToListenConfig(ifaceName, lc, network, address)
+func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, network, address string, rAddrPort netip.AddrPort) (string, error) {
+	return fallbackBindIfaceToListenConfig(ifaceName, lc, network, address, rAddrPort)
 }
 
 func ParseNetwork(network string, addr netip.Addr) string {

component/dialer/bind_windows.go

@@ -36,7 +36,7 @@ func bind6(handle syscall.Handle, ifaceIdx int) error {
 	return err
 }
 
-func bindControl(ifaceIdx int) controlFn {
+func bindControl(ifaceIdx int, rAddrPort netip.AddrPort) controlFn {
 	return func(ctx context.Context, network, address string, c syscall.RawConn) (err error) {
 		addrPort, err := netip.ParseAddrPort(address)
 		if err == nil && !addrPort.Addr().IsGlobalUnicast() {
@@ -55,7 +55,7 @@ func bindControl(ifaceIdx int) controlFn {
 				innerErr = bind4err
 			case "udp6":
 				// golang will set network to udp6 when listenUDP on wildcard ip (eg: ":0", "")
-				if (!addrPort.Addr().IsValid() || addrPort.Addr().IsUnspecified()) && bind6err != nil {
+				if (!addrPort.Addr().IsValid() || addrPort.Addr().IsUnspecified()) && bind6err != nil && rAddrPort.Addr().Unmap().Is4() {
 					// try bind ipv6, if failed, ignore. it's a workaround for windows disable interface ipv6
 					if bind4err != nil {
 						innerErr = fmt.Errorf("%w (%s)", bind6err, bind4err)
@@ -76,23 +76,23 @@ func bindControl(ifaceIdx int) controlFn {
 	}
 }
 
-func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.Addr) error {
+func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, destination netip.Addr) error {
 	ifaceObj, err := iface.ResolveInterface(ifaceName)
 	if err != nil {
 		return err
 	}
 
-	addControlToDialer(dialer, bindControl(ifaceObj.Index))
+	addControlToDialer(dialer, bindControl(ifaceObj.Index, netip.AddrPortFrom(destination, 0)))
 	return nil
 }
 
-func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
+func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string, rAddrPort netip.AddrPort) (string, error) {
 	ifaceObj, err := iface.ResolveInterface(ifaceName)
 	if err != nil {
 		return "", err
 	}
 
-	addControlToListenConfig(lc, bindControl(ifaceObj.Index))
+	addControlToListenConfig(lc, bindControl(ifaceObj.Index, rAddrPort))
 	return address, nil
 }
 

component/dialer/dialer.go

@@ -78,7 +78,7 @@ func DialContext(ctx context.Context, network, address string, options ...Option
 	}
 }
 
-func ListenPacket(ctx context.Context, network, address string, options ...Option) (net.PacketConn, error) {
+func ListenPacket(ctx context.Context, network, address string, rAddrPort netip.AddrPort, options ...Option) (net.PacketConn, error) {
 	if features.CMFA && DefaultSocketHook != nil {
 		return listenPacketHooked(ctx, network, address)
 	}
@@ -91,7 +91,7 @@ func ListenPacket(ctx context.Context, network, address string, options ...Optio
 		if cfg.fallbackBind {
 			bind = fallbackBindIfaceToListenConfig
 		}
-		addr, err := bind(cfg.interfaceName, lc, network, address)
+		addr, err := bind(cfg.interfaceName, lc, network, address, rAddrPort)
 		if err != nil {
 			return nil, err
 		}
@@ -133,11 +133,9 @@ func dialContext(ctx context.Context, network string, destination netip.Addr, po
 
 	var address string
 	if IP4PEnable {
-		NewDestination, NewPort := lookupIP4P(destination.String(), port)
-		address = net.JoinHostPort(NewDestination, NewPort)
-	} else {
-		address = net.JoinHostPort(destination.String(), port)
+		destination, port = lookupIP4P(destination, port)
 	}
+	address = net.JoinHostPort(destination.String(), port)
 
 	netDialer := opt.netDialer
 	switch netDialer.(type) {
@@ -385,7 +383,7 @@ func (d Dialer) ListenPacket(ctx context.Context, network, address string, rAddr
 		// avoid "The requested address is not valid in its context."
 		opt = WithInterface("")
 	}
-	return ListenPacket(ctx, ParseNetwork(network, rAddrPort.Addr()), address, opt)
+	return ListenPacket(ctx, ParseNetwork(network, rAddrPort.Addr()), address, rAddrPort, opt)
 }
 
 func NewDialer(options ...Option) Dialer {
@@ -399,13 +397,13 @@ func GetIP4PEnable(enableIP4PConvert bool) {
 
 // kanged from https://github.com/heiher/frp/blob/ip4p/client/ip4p.go
 
-func lookupIP4P(addr string, port string) (string, string) {
-	ip := net.ParseIP(addr)
+func lookupIP4P(addr netip.Addr, port string) (netip.Addr, string) {
+	ip := addr.AsSlice()
 	if ip[0] == 0x20 && ip[1] == 0x01 &&
 		ip[2] == 0x00 && ip[3] == 0x00 {
-		addr = net.IPv4(ip[12], ip[13], ip[14], ip[15]).String()
+		addr = netip.AddrFrom4([4]byte{ip[12], ip[13], ip[14], ip[15]})
 		port = strconv.Itoa(int(ip[10])<<8 + int(ip[11]))
-		log.Debugln("Convert IP4P address %s to %s", ip, net.JoinHostPort(addr, port))
+		log.Debugln("Convert IP4P address %s to %s", ip, net.JoinHostPort(addr.String(), port))
 		return addr, port
 	}
 	return addr, port