mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-15 12:00:29 +00:00
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
package yggdrasil
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// The linux platform specific tun parts
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import (
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"errors"
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"fmt"
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"net"
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"github.com/docker/libcontainer/netlink"
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water "github.com/yggdrasil-network/water"
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)
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// Configures the TAP adapter with the correct IPv6 address and MTU.
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func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
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var config water.Config
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if iftapmode {
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config = water.Config{DeviceType: water.TAP}
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} else {
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config = water.Config{DeviceType: water.TUN}
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}
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if ifname != "" && ifname != "auto" {
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config.Name = ifname
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}
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iface, err := water.New(config)
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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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tun.mtu = getSupportedMTU(mtu)
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// The following check is specific to Linux, as the TAP driver only supports
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// an MTU of 65535-14 to make room for the ethernet headers. This makes sure
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// that the MTU gets rounded down to 65521 instead of causing a panic.
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if iftapmode {
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if tun.mtu > 65535-tun_ETHER_HEADER_LENGTH {
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tun.mtu = 65535 - tun_ETHER_HEADER_LENGTH
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}
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}
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// Friendly output
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tun.core.log.Printf("Interface name: %s", tun.iface.Name())
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tun.core.log.Printf("Interface IPv6: %s", addr)
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tun.core.log.Printf("Interface MTU: %d", tun.mtu)
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return tun.setupAddress(addr)
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}
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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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func (tun *tunAdapter) setupAddress(addr string) error {
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// Set address
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var netIF *net.Interface
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ifces, err := net.Interfaces()
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if err != nil {
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return err
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}
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for _, ifce := range ifces {
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if ifce.Name == tun.iface.Name() {
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var newIF = ifce
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netIF = &newIF // Don't point inside ifces, it's apparently unsafe?...
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}
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}
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if netIF == nil {
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return errors.New(fmt.Sprintf("Failed to find interface: %s", tun.iface.Name()))
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}
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ip, ipNet, err := net.ParseCIDR(addr)
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if err != nil {
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return err
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}
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err = netlink.NetworkLinkAddIp(netIF, ip, ipNet)
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if err != nil {
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return err
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}
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err = netlink.NetworkSetMTU(netIF, tun.mtu)
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if err != nil {
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return err
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}
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netlink.NetworkLinkUp(netIF)
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if err != nil {
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return err
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}
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return nil
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}
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