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https://github.com/impact-eintr/netstack.git
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google永远的神
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@@ -4,20 +4,26 @@ import (
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"sync"
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"github.com/impact-eintr/netstack/tcpip"
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"github.com/impact-eintr/netstack/tcpip/buffer"
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"github.com/impact-eintr/netstack/tcpip/ilist"
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)
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// referenced 引用的
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type referencedNetworkEndpoint struct {
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//ilist.Entry
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//refs int32
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//ep NetworkEndpoint
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//nic *NIC
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//protocol tcpip.NetworkProtocolNumber
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//linkCache LinkAddressCache
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//holdsInserRef bool
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ilist.Entry // 一個侵入式链表
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refs int32
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ep NetworkEndpoint
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nic *NIC
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protocol tcpip.NetworkProtocolNumber
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// 如果为此协议启用了链接地址解析,则设置 linkCache。 否则设置为零。
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linkCache LinkAddressCache
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// holdInsertRef 受 NIC 的互斥锁保护。 它指示引用计数是否由于端点的插入而偏向 1。
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// 当在 NIC 上调用 RemoveAddress 时,它会重置为 false。
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holdsInserRef bool
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}
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// 代表一个网卡对象
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// 代表一个网卡对象 network interface controller
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type NIC struct {
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stack *Stack
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// 每个网卡唯一的标识号
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@@ -55,3 +61,63 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint) *NIC {
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type NetworkEndpointID struct {
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LocalAddress tcpip.Address
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}
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// 添加当前的NIC到链路层设备,激活该NIC
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func (n *NIC) attachLinkEndpint() {
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n.linkEP.Attach(n)
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}
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// 在NIC上添加addr地址 注册和初始化网络层协议
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// 相当于给网卡添加ip地址
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func (n *NIC) addAddressLocked(protocol tcpip.NetworkProtocolNumber, addr tcpip.Address,
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peb PrimaryEndpointBehavior, replace bool) (*referencedNetworkEndpoint, *tcpip.Error) {
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// 查看是否支持该协议 若不支持则返回错误
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netProto, ok := n.stack.networkProtocols[protocol]
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if !ok {
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return nil, tcpip.ErrUnknowProtocol
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}
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// 比如netProto是ipv4 就会调用ipv4,NewEndpoint,新建一个网络层端
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ep, err := netProto.NewEndpoint(n.id, addr, n.stack, n, n.linkEP)
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if err != nil {
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return nil, err
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}
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// 获取网络层id 即ip地址
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id := *ep.ID()
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if ref, ok := n.endpoints[id]; ok {
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// 不是替换,且该id不存在,返回错误
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if !replace {
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return nil, tcpip.ErrDuplicateAddress // duplicate 复制的
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}
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n.removeEndpointLocked(ref)
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}
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ref := &referencedNetworkEndpoint{
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refs: 1,
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ep: ep,
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nic: n,
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protocol: protocol,
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holdsInserRef: true,
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}
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if n.linkEP.Capabilities()&CapabilityResolutionRequired != 0 {
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}
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// 注册该网络端
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}
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// DeliverTransportPacket 将数据包传送到适当的传输协议端点。
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func (n *NIC) DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber,
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vv buffer.VectorisedView) {
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}
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// DeliverTransportControlPacket 将控制数据包传送到适当的传输协议端点。
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func (n *NIC) DeliverTransportControlPacket(local, remote tcpip.Address,
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net tcpip.NetworkProtocolNumber, trans tcpip.TransportProtocolNumber,
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typ ControlType, extra uint32, vv buffer.VectorisedView) {
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}
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