mirror of
https://github.com/kubenetworks/kubevpn.git
synced 2025-12-24 11:51:13 +08:00
107 lines
2.1 KiB
Go
107 lines
2.1 KiB
Go
//go:build linux
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package tun
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import (
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"errors"
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"fmt"
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"net"
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"os"
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"syscall"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/docker/libcontainer/netlink"
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"github.com/milosgajdos/tenus"
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log "github.com/sirupsen/logrus"
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"golang.zx2c4.com/wireguard/tun"
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"github.com/wencaiwulue/kubevpn/pkg/config"
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)
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func createTun(cfg Config) (conn net.Conn, itf *net.Interface, err error) {
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ip, ipNet, err := net.ParseCIDR(cfg.Addr)
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if err != nil {
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return
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}
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mtu := cfg.MTU
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if mtu <= 0 {
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mtu = config.DefaultMTU
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}
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var ifce tun.Device
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ifce, err = tun.CreateTUN("utun", mtu)
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if err != nil {
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return
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}
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var name string
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name, err = ifce.Name()
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if err != nil {
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return
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}
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link, err := tenus.NewLinkFrom(name)
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if err != nil {
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return
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}
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cmd := fmt.Sprintf("ip link set dev %s mtu %d", name, mtu)
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log.Debugf("[tun] %s", cmd)
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if er := link.SetLinkMTU(mtu); er != nil {
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err = fmt.Errorf("%s: %v", cmd, er)
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return
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}
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cmd = fmt.Sprintf("ip address add %s dev %s", cfg.Addr, name)
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log.Debugf("[tun] %s", cmd)
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if er := link.SetLinkIp(ip, ipNet); er != nil {
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err = fmt.Errorf("%s: %v", cmd, er)
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return
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}
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cmd = fmt.Sprintf("ip link set dev %s up", name)
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log.Debugf("[tun] %s", cmd)
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if er := link.SetLinkUp(); er != nil {
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err = fmt.Errorf("%s: %v", cmd, er)
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return
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}
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if err = os.Setenv(config.EnvTunNameOrLUID, name); err != nil {
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return nil, nil, err
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}
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if err = addTunRoutes(name, cfg.Routes...); err != nil {
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return
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}
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itf, err = net.InterfaceByName(name)
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if err != nil {
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return
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}
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conn = &tunConn{
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ifce: ifce,
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addr: &net.IPAddr{IP: ip},
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}
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return
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}
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func addTunRoutes(ifName string, routes ...types.Route) error {
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for _, route := range routes {
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if route.Dst.String() == "" {
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continue
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}
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cmd := fmt.Sprintf("ip route add %s dev %s", route.Dst.String(), ifName)
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log.Debugf("[tun] %s", cmd)
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if err := netlink.AddRoute(route.Dst.String(), "", "", ifName); err != nil && !errors.Is(err, syscall.EEXIST) {
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return fmt.Errorf("%s: %v", cmd, err)
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}
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}
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return nil
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}
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func getInterface() (*net.Interface, error) {
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return net.InterfaceByName(os.Getenv(config.EnvTunNameOrLUID))
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}
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