138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package handler
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import (
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"fmt"
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"net"
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"os"
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"strings"
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"syscall"
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"unsafe"
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"github.com/bjdgyc/anylink/base"
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"github.com/bjdgyc/anylink/pkg/utils"
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"github.com/bjdgyc/anylink/sessdata"
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)
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// link vtap
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const vTapPrefix = "lvtap"
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type Vtap struct {
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*os.File
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ifName string
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}
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func (v *Vtap) Close() error {
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v.File.Close()
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cmdstr := fmt.Sprintf("ip link del %s", v.ifName)
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return execCmd([]string{cmdstr})
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}
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func checkMacvtap() {
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_setGateway()
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_checkTapIp(base.Cfg.Ipv4Master)
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ifName := "anylinkMacvtap"
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// 加载 macvtap
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cmdstr0 := fmt.Sprintf("modprobe -i macvtap")
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// 开启主网卡混杂模式
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cmdstr1 := fmt.Sprintf("ip link set dev %s promisc on", base.Cfg.Ipv4Master)
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// 测试 macvtap 功能
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cmdstr2 := fmt.Sprintf("ip link add link %s name %s type macvtap mode bridge", base.Cfg.Ipv4Master, ifName)
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cmdstr3 := fmt.Sprintf("ip link del %s", ifName)
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err := execCmd([]string{cmdstr0, cmdstr1, cmdstr2, cmdstr3})
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if err != nil {
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base.Fatal(err)
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}
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}
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// 创建 Macvtap 网卡
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func LinkMacvtap(cSess *sessdata.ConnSession) error {
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capL := sessdata.IpPool.IpLongMax - sessdata.IpPool.IpLongMin
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ipN := utils.Ip2long(cSess.IpAddr) % capL
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ifName := fmt.Sprintf("%s%d", vTapPrefix, ipN)
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cSess.SetIfName(ifName)
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cmdstr1 := fmt.Sprintf("ip link add link %s name %s type macvtap mode bridge", base.Cfg.Ipv4Master, ifName)
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cmdstr2 := fmt.Sprintf("ip link set dev %s up mtu %d address %s", ifName, cSess.Mtu, cSess.MacHw)
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err := execCmd([]string{cmdstr1, cmdstr2})
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if err != nil {
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base.Error(err)
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return err
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}
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cmdstr3 := fmt.Sprintf("sysctl -w net.ipv6.conf.%s.disable_ipv6=1", ifName)
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execCmd([]string{cmdstr3})
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return createVtap(cSess, ifName)
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}
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func checkIpvtap() {
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}
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// 创建 Ipvtap 网卡
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func LinkIpvtap(cSess *sessdata.ConnSession) error {
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return nil
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}
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type ifReq struct {
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Name [0x10]byte
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Flags uint16
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pad [0x28 - 0x10 - 2]byte
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}
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func createVtap(cSess *sessdata.ConnSession, ifName string) error {
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// 初始化 ifName
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inf, err := net.InterfaceByName(ifName)
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if err != nil {
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base.Error(err)
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return err
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}
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tName := fmt.Sprintf("/dev/tap%d", inf.Index)
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var fdInt int
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fdInt, err = syscall.Open(tName, syscall.O_RDWR|syscall.O_NONBLOCK, 0)
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if err != nil {
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return err
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}
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var flags uint16 = syscall.IFF_TAP | syscall.IFF_NO_PI
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var req ifReq
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req.Flags = flags
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_, _, errno := syscall.Syscall(
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syscall.SYS_IOCTL,
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uintptr(fdInt),
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uintptr(syscall.TUNSETIFF),
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uintptr(unsafe.Pointer(&req)),
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)
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if errno != 0 {
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return os.NewSyscallError("ioctl", errno)
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}
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file := os.NewFile(uintptr(fdInt), tName)
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ifce := &Vtap{file, ifName}
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go allTapRead(ifce, cSess)
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go allTapWrite(ifce, cSess)
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return nil
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}
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// 销毁未关闭的vtap
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func destroyVtap() {
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its, err := net.Interfaces()
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if err != nil {
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base.Error(err)
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return
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}
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for _, v := range its {
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if strings.HasPrefix(v.Name, vTapPrefix) {
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// 删除原来的网卡
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cmdstr := fmt.Sprintf("ip link del %s", v.Name)
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execCmd([]string{cmdstr})
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}
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}
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}
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