Initialize L3 routing support

route/router_ip.go

@@ -0,0 +1,47 @@
+package route
+
+import (
+	"context"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-tun"
+)
+
+func (r *Router) RouteIPConnection(ctx context.Context, conn tun.RouteContext, metadata adapter.InboundContext) tun.RouteAction {
+	for i, rule := range r.ipRules {
+		if rule.Match(&metadata) {
+			if rule.Action() == tun.ActionTypeReject {
+				r.logger.InfoContext(ctx, "match[", i, "] ", rule.String(), " => reject")
+				return (*tun.ActionReject)(nil)
+			}
+			detour := rule.Outbound()
+			r.logger.InfoContext(ctx, "match[", i, "] ", rule.String(), " => ", detour)
+			outbound, loaded := r.Outbound(detour)
+			if !loaded {
+				r.logger.ErrorContext(ctx, "outbound not found: ", detour)
+				break
+			}
+			ipOutbound, loaded := outbound.(adapter.IPOutbound)
+			if !loaded {
+				r.logger.ErrorContext(ctx, "outbound have no ip connection support: ", detour)
+				break
+			}
+			destination, err := ipOutbound.NewIPConnection(ctx, conn, metadata)
+			if err != nil {
+				r.logger.ErrorContext(ctx, err)
+				break
+			}
+			return &tun.ActionDirect{DirectDestination: destination}
+		}
+	}
+	return (*tun.ActionReturn)(nil)
+}
+
+func (r *Router) NatRequired(outbound string) bool {
+	for _, ipRule := range r.ipRules {
+		if ipRule.Outbound() == outbound {
+			return true
+		}
+	}
+	return false
+}