google永远的神

tcpip/link/fdbased/endpoint.go

@@ -1 +1,47 @@
 package fdbased
+
+import (
+	"syscall"
+
+	"github.com/impact-eintr/netstack/tcpip"
+	"github.com/impact-eintr/netstack/tcpip/buffer"
+	"github.com/impact-eintr/netstack/tcpip/stack"
+)
+
+// 负责底层网卡的io读写以及数据分发
+type endpoint struct {
+	// 发送和接收数据的文件描述符
+	fd int
+
+	// 单个帧的最大长度
+	mtu uint32
+
+	// 以太网头部长度
+	hdrSize int
+
+	// 网卡地址
+	addr tcpip.LinkAddress
+
+	// 网卡的能力
+	caps stack.LinkEndpointCapabilities
+
+	// closed is a function to be called when the FD's peer (if any) closes
+	// its end of the communication pipe.
+	closed func(*tcpip.Error)
+
+	iovecs     []syscall.Iovec
+	views      []buffer.View
+	dispatcher stack.NetworkDispatcher
+
+	// handleLocal indicates whether packets destined to itself should be
+	// handled by the netstack internally (true) or be forwarded to the FD
+	// endpoint (false).
+	// handleLocal指示发往自身的数据包是由内部netstack处理（true）还是转发到FD端点（false）。
+	// Resend packets back to netstack if destined to itself
+	// Add option to redirect packet back to netstack if it's destined to itself.
+	// This fixes the problem where connecting to the local NIC address would
+	// not work, e.g.:
+	// echo bar | nc -l -p 8080 &
+	// echo foo | nc 192.168.0.2 8080
+	handleLocal bool
+}