emmm 注册式网络栈不太好写

tcpip/link/loopback/loopback.go

@@ -1,12 +1,15 @@
 package loopback
 
 import (
+	"fmt"
+	"netstack/logger"
 	"netstack/tcpip"
 	"netstack/tcpip/buffer"
 	"netstack/tcpip/stack"
 )
 
 type endpoint struct {
+	count      int
 	dispatcher stack.NetworkDispatcher
 }
 
@@ -43,6 +46,13 @@ func (e *endpoint) WritePacket(r *stack.Route, hdr buffer.Prependable, payload b
 	views = append(views, payload.Views()...)
 	vv := buffer.NewVectorisedView(len(views[0])+payload.Size(), views)
 
+	// TODO 这里整点活 在特定的情况下丢掉数据报 模拟网络阻塞
+
+	e.count++
+	if e.count == 5 || e.count == 7 || e.count == 9 {
+		logger.NOTICE(fmt.Sprintf("统计 %d  丢掉这个报文", e.count))
+		return nil
+	}
 	// Because we're immediately turning around and writing the packet back to the
 	// rx path, we intentionally don't preserve the remote and local link
 	// addresses from the stack.Route we're passed.