处理sleep的链接问题

tcpip/stack/stack.go

@@ -0,0 +1,75 @@
+package stack
+
+import (
+	"netstack/tcpip"
+	"netstack/tcpip/ports"
+	"sync"
+)
+
+// TODO 需要解读
+type TCPProbeFunc func(s TcpEndpointState)
+
+// TODO 需要解读
+type TcpEndpointState struct {
+	// TODO 需要添加
+}
+
+type transportProtocolState struct {
+}
+
+// Stack 是一个网络堆栈，具有所有支持的协议、NIC 和路由表。
+type Stack struct {
+	transportProtocols map[tcpip.TransportProtocolNumber]*transportProtocolState // 各种传输层协议
+	networkProtocols   map[tcpip.NetworkProtocolNumber]NetworkProtocol           // 各种网络层协议
+	linkAddrResolvers  map[tcpip.NetworkProtocolNumber]LinkAddressResolver       // 各种传输层协议
+
+	demux *transportDemuxer // 传输层的复用器
+
+	stats tcpip.Stats // 网络栈的状态监测器
+
+	linkAddrCache *linkAddrCache // 链路层地址的缓存
+
+	mu         sync.RWMutex
+	nics       map[tcpip.NICID]*NIC // 所有的网卡设备
+	forwarding bool                 // 是否正在转发
+
+	// route is the route table passed in by the user via SetRouteTable(),
+	// it is used by FindRoute() to build a route for a specific
+	// destination.
+	routeTable []tcpip.Route // 路由表
+
+	*ports.PortManager // 端口管理器
+
+	// If not nil, then any new endpoints will have this probe function
+	// invoked everytime they receive a TCP segment.
+	tcpProbeFunc TCPProbeFunc
+
+	// clock is used to generate user-visible times.
+	clock tcpip.Clock
+}
+
+func (s *Stack) CreateNIC(id tcpip.NICID, linkEP tcpip.LinkEndpointID) *tcpip.Error {
+	return s.createNIC(id, "", linkEP, true)
+}
+
+// 新建一个网卡对象，并且激活它 激活就是准备好熊网卡中读取和写入数据
+func (s *Stack) createNIC(id tcpip.NICID, name string, linkEP tcpip.LinkEndpointID, enable bool) *tcpip.Error {
+	ep := FindLinkEndpoint(linkEP)
+	if ep == nil {
+		return tcpip.ErrBadLinkEndpoint
+	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	// Make sure id is unique
+	if _, ok := s.nics[id]; ok {
+		return tcpip.ErrDuplicateNICID
+	}
+	n := newIC(s, id, name, ep)
+
+	s.nics[id] = n
+	if enable {
+		n.attachLinkEndpoint()
+	}
+}