2019-01-02 18:05:54 +00:00
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// +build !mobile
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2019-03-28 00:30:25 +00:00
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package tuntap
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2017-12-28 22:16:20 -06:00
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// The linux platform specific tun parts
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2018-06-12 17:50:08 -05:00
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import (
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2019-08-14 19:32:40 +01:00
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"github.com/vishvananda/netlink"
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2019-11-22 16:43:50 +00:00
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wgtun "golang.zx2c4.com/wireguard/tun"
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2018-06-12 17:50:08 -05:00
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)
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2018-03-03 16:41:36 -06:00
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2019-11-22 16:43:50 +00:00
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// Configures the TUN adapter with the correct IPv6 address and MTU.
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2020-01-05 17:27:54 +00:00
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func (tun *TunAdapter) setup(ifname string, addr string, mtu MTU) error {
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2019-11-22 20:07:08 +00:00
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if ifname == "auto" {
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ifname = "\000"
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}
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2020-01-05 17:27:54 +00:00
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iface, err := wgtun.CreateTUN(ifname, int(mtu))
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2018-01-04 22:37:51 +00:00
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if err != nil {
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panic(err)
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}
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tun.iface = iface
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2019-11-22 16:43:50 +00:00
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if mtu, err := iface.MTU(); err == nil {
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2020-01-05 17:27:54 +00:00
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tun.mtu = getSupportedMTU(MTU(mtu))
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2019-11-22 16:43:50 +00:00
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} else {
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tun.mtu = 0
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}
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2018-01-04 22:37:51 +00:00
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return tun.setupAddress(addr)
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2018-01-04 22:34:17 +00:00
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}
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2018-06-12 22:45:53 +01:00
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// Configures the TAP adapter with the correct IPv6 address and MTU. Netlink
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// is used to do this, so there is not a hard requirement on "ip" or "ifconfig"
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// to exist on the system, but this will fail if Netlink is not present in the
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// kernel (it nearly always is).
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2019-03-28 00:30:25 +00:00
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func (tun *TunAdapter) setupAddress(addr string) error {
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2019-08-14 19:32:40 +01:00
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nladdr, err := netlink.ParseAddr(addr)
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2018-03-03 16:41:36 -06:00
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if err != nil {
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return err
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}
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2019-11-22 18:39:27 +00:00
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nlintf, err := netlink.LinkByName(tun.Name())
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2018-03-03 16:41:36 -06:00
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if err != nil {
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return err
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}
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2019-08-14 19:32:40 +01:00
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if err := netlink.AddrAdd(nlintf, nladdr); err != nil {
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2018-03-03 16:41:36 -06:00
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return err
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}
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2020-01-05 17:27:54 +00:00
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if err := netlink.LinkSetMTU(nlintf, int(tun.mtu)); err != nil {
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2018-01-04 22:37:51 +00:00
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return err
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}
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2019-08-14 19:32:40 +01:00
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if err := netlink.LinkSetUp(nlintf); err != nil {
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2018-01-04 22:37:51 +00:00
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return err
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}
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2019-11-22 16:43:50 +00:00
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// Friendly output
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2019-11-22 18:39:27 +00:00
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tun.log.Infof("Interface name: %s", tun.Name())
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2019-11-22 16:43:50 +00:00
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tun.log.Infof("Interface IPv6: %s", addr)
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tun.log.Infof("Interface MTU: %d", tun.mtu)
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2018-01-04 22:37:51 +00:00
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return nil
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2017-12-28 22:16:20 -06:00
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}
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