diff --git a/route/process_cache.go b/route/process_cache.go
index 691a4e8e..01b477c4 100644
--- a/route/process_cache.go
+++ b/route/process_cache.go
@@ -3,6 +3,7 @@ package route
 import (
 	"context"
 	"net/netip"
+	"strings"
 
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/process"
@@ -32,3 +33,60 @@ func (r *Router) findProcessInfoCached(ctx context.Context, network string, sour
 	r.processCache.Add(key, processCacheEntry{result: result, err: err})
 	return result, err
 }
+
+func (r *Router) searchProcessInfo(ctx context.Context, metadata *adapter.InboundContext) {
+	if r.processSearcher == nil || metadata.ProcessInfo != nil || !r.isLocalSource(metadata.Source.Addr) {
+		return
+	}
+	var originDestination netip.AddrPort
+	if metadata.OriginDestination.IsValid() {
+		originDestination = metadata.OriginDestination.AddrPort()
+	} else if metadata.Destination.IsIP() {
+		originDestination = metadata.Destination.AddrPort()
+	}
+	processInfo, err := r.findProcessInfoCached(ctx, metadata.Network, metadata.Source.AddrPort(), originDestination)
+	if err != nil {
+		r.logger.InfoContext(ctx, "failed to search process: ", err)
+		return
+	}
+	metadata.ProcessInfo = processInfo
+	if processInfo.ProcessPath != "" {
+		if processInfo.UserName != "" {
+			r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath, ", user: ", processInfo.UserName)
+		} else if processInfo.UserId != -1 {
+			r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath, ", user id: ", processInfo.UserId)
+		} else {
+			r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath)
+		}
+		return
+	}
+	if len(processInfo.AndroidPackageNames) > 0 {
+		r.logger.InfoContext(ctx, "found package name: ", strings.Join(processInfo.AndroidPackageNames, ", "))
+		return
+	}
+	if processInfo.UserId != -1 {
+		if processInfo.UserName != "" {
+			r.logger.InfoContext(ctx, "found user: ", processInfo.UserName)
+		} else {
+			r.logger.InfoContext(ctx, "found user id: ", processInfo.UserId)
+		}
+	}
+}
+
+func (r *Router) isLocalSource(source netip.Addr) bool {
+	if !source.IsValid() {
+		return false
+	}
+	source = source.Unmap()
+	if source.IsLoopback() {
+		return true
+	}
+	for _, netInterface := range r.network.InterfaceFinder().Interfaces() {
+		for _, prefix := range netInterface.Addresses {
+			if prefix.Addr().Unmap() == source {
+				return true
+			}
+		}
+	}
+	return false
+}
diff --git a/route/route.go b/route/route.go
index 77b66ea4..7c24219e 100644
--- a/route/route.go
+++ b/route/route.go
@@ -407,37 +407,7 @@ func (r *Router) matchRule(
 	selectedRule adapter.Rule, selectedRuleIndex int,
 	buffers []*buf.Buffer, packetBuffers []*N.PacketBuffer, fatalErr error,
 ) {
-	if r.processSearcher != nil && metadata.ProcessInfo == nil {
-		var originDestination netip.AddrPort
-		if metadata.OriginDestination.IsValid() {
-			originDestination = metadata.OriginDestination.AddrPort()
-		} else if metadata.Destination.IsIP() {
-			originDestination = metadata.Destination.AddrPort()
-		}
-		processInfo, fErr := r.findProcessInfoCached(ctx, metadata.Network, metadata.Source.AddrPort(), originDestination)
-		if fErr != nil {
-			r.logger.InfoContext(ctx, "failed to search process: ", fErr)
-		} else {
-			if processInfo.ProcessPath != "" {
-				if processInfo.UserName != "" {
-					r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath, ", user: ", processInfo.UserName)
-				} else if processInfo.UserId != -1 {
-					r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath, ", user id: ", processInfo.UserId)
-				} else {
-					r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath)
-				}
-			} else if len(processInfo.AndroidPackageNames) > 0 {
-				r.logger.InfoContext(ctx, "found package name: ", strings.Join(processInfo.AndroidPackageNames, ", "))
-			} else if processInfo.UserId != -1 {
-				if processInfo.UserName != "" {
-					r.logger.InfoContext(ctx, "found user: ", processInfo.UserName)
-				} else {
-					r.logger.InfoContext(ctx, "found user id: ", processInfo.UserId)
-				}
-			}
-			metadata.ProcessInfo = processInfo
-		}
-	}
+	r.searchProcessInfo(ctx, metadata)
 	if metadata.Destination.Addr.IsValid() && r.dnsTransport.FakeIP() != nil && r.dnsTransport.FakeIP().Store().Contains(metadata.Destination.Addr) {
 		domain, loaded := r.dnsTransport.FakeIP().Store().Lookup(metadata.Destination.Addr)
 		if !loaded {