From fdaa6a22a4d14ccb08a5173128e1c47585678627 Mon Sep 17 00:00:00 2001
From: Mars160 <74127225+Mars160@users.noreply.github.com>
Date: Sun, 4 Jun 2023 23:43:54 +0800
Subject: [PATCH] fix hysteria faketcp lookback in TUN mode (#601)

---
 component/dialer/bind.go |  2 +-
 component/iface/iface.go | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/component/dialer/bind.go b/component/dialer/bind.go
index 34d40ca2..edfc79c7 100644
--- a/component/dialer/bind.go
+++ b/component/dialer/bind.go
@@ -22,7 +22,7 @@ func LookupLocalAddrFromIfaceName(ifaceName string, network string, destination
 		addr, err = ifaceObj.PickIPv6Addr(destination)
 	default:
 		if destination.IsValid() {
-			if destination.Is4() {
+			if destination.Is4() || destination.Is4In6() {
 				addr, err = ifaceObj.PickIPv4Addr(destination)
 			} else {
 				addr, err = ifaceObj.PickIPv6Addr(destination)
diff --git a/component/iface/iface.go b/component/iface/iface.go
index 11c754f8..c32b65ab 100644
--- a/component/iface/iface.go
+++ b/component/iface/iface.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"net"
 	"net/netip"
+	"strings"
 	"time"
 
 	"github.com/Dreamacro/clash/common/singledo"
@@ -37,12 +38,21 @@ func ResolveInterface(name string) (*Interface, error) {
 			if err != nil {
 				continue
 			}
+			// if not available device like Meta, dummy0, docker0, etc.
+			if (iface.Flags&net.FlagMulticast == 0) || (iface.Flags&net.FlagPointToPoint != 0) || (iface.Flags&net.FlagRunning == 0) {
+				continue
+			}
 
 			ipNets := make([]*netip.Prefix, 0, len(addrs))
 			for _, addr := range addrs {
 				ipNet := addr.(*net.IPNet)
 				ip, _ := netip.AddrFromSlice(ipNet.IP)
 
+				//unavailable IPv6 Address
+				if ip.Is6() && strings.HasPrefix(ip.String(), "fe80") {
+					continue
+				}
+
 				ones, bits := ipNet.Mask.Size()
 				if bits == 32 {
 					ip = ip.Unmap()