86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
// +build linux
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package gost
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import (
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"fmt"
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"net"
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"github.com/docker/libcontainer/netlink"
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"github.com/go-log/log"
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"github.com/milosgajdos83/tenus"
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"github.com/songgao/water"
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)
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func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, 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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ifce, err := water.New(water.Config{
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DeviceType: water.TUN,
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PlatformSpecificParams: water.PlatformSpecificParams{
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Name: cfg.Name,
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},
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})
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if err != nil {
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return
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}
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link, err := tenus.NewLinkFrom(ifce.Name())
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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 = DefaultMTU
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}
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cmd := fmt.Sprintf("ip link set dev %s mtu %d", ifce.Name(), mtu)
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log.Log("[tun]", 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, ifce.Name())
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log.Log("[tun]", 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", ifce.Name())
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log.Log("[tun]", 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 = addRoutes(ifce.Name(), cfg.Routes...); 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 addRoutes(ifName string, routes ...string) error {
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for _, route := range routes {
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if route == "" {
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continue
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}
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cmd := fmt.Sprintf("ip route add %s dev %s", route, ifName)
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log.Log("[tun]", cmd)
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if err := netlink.AddRoute(route, "", "", ifName); err != nil {
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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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