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Fix MTU issues with TAP adapters

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This commit is contained in:
Neil Alexander 2018-01-25 17:44:56 +00:00
parent d52fab8af6
commit e44f64bea0
2 changed files with 31 additions and 7 deletions
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17
src/yggdrasil/tun.go
View File

@ -5,6 +5,7 @@ package yggdrasil
import ethernet "github.com/songgao/packets/ethernet" import ethernet "github.com/songgao/packets/ethernet"
const IPv6_HEADER_LENGTH = 40 const IPv6_HEADER_LENGTH = 40
const ETHER_HEADER_LENGTH = 14
type tunInterface interface { type tunInterface interface {
IsTUN() bool IsTUN() bool
@ -40,13 +41,13 @@ func (tun *tunDevice) write() error {
ethernet.NotTagged, // VLAN tagging ethernet.NotTagged, // VLAN tagging
ethernet.IPv6, // Ethertype ethernet.IPv6, // Ethertype
len(data)) // Payload length len(data)) // Payload length
copy(frame[14:], data[:]) copy(frame[ETHER_HEADER_LENGTH:], data[:])
if _, err := tun.iface.Write(frame); err != nil { if _, err := tun.iface.Write(frame); err != nil {
return err panic(err)
} }
} else { } else {
if _, err := tun.iface.Write(data); err != nil { if _, err := tun.iface.Write(data); err != nil {
return err panic(err)
} }
} }
util_putBytes(data) util_putBytes(data)
@ -54,15 +55,19 @@ func (tun *tunDevice) write() error {
} }
func (tun *tunDevice) read() error { func (tun *tunDevice) read() error {
buf := make([]byte, tun.mtu) mtu := tun.mtu
if tun.iface.IsTAP() {
mtu += ETHER_HEADER_LENGTH
}
buf := make([]byte, mtu)
for { for {
n, err := tun.iface.Read(buf) n, err := tun.iface.Read(buf)
if err != nil { if err != nil {
return err panic(err)
} }
o := 0 o := 0
if tun.iface.IsTAP() { if tun.iface.IsTAP() {
o = 14 o = ETHER_HEADER_LENGTH
b := make([]byte, n) b := make([]byte, n)
copy(b, buf) copy(b, buf)
tun.ndp.recv <- b tun.ndp.recv <- b

21
src/yggdrasil/tun_windows.go
View File

@ -39,12 +39,31 @@ func (tun *tunDevice) setup(ifname string, addr string, mtu int) error {
} }
tun.iface = iface tun.iface = iface
tun.mtu = mtu tun.mtu = mtu
err = tun.setupMTU(tun.mtu)
if err != nil {
panic(err)
}
return tun.setupAddress(addr) return tun.setupAddress(addr)
} }
func (tun *tunDevice) setupMTU(mtu int) error {
// Set MTU
cmd := exec.Command("netsh", "interface", "ipv6", "set", "subinterface",
fmt.Sprintf("interface=%s", tun.iface.Name()),
fmt.Sprintf("mtu=%d", mtu),
"store=active")
tun.core.log.Printf("netsh command: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("Windows netsh failed: %v.", err)
tun.core.log.Println(string(output))
return err
}
return nil
}
func (tun *tunDevice) setupAddress(addr string) error { func (tun *tunDevice) setupAddress(addr string) error {
// Set address // Set address
// addr = strings.TrimRight(addr, "/8")
cmd := exec.Command("netsh", "interface", "ipv6", "add", "address", cmd := exec.Command("netsh", "interface", "ipv6", "add", "address",
fmt.Sprintf("interface=%s", tun.iface.Name()), fmt.Sprintf("interface=%s", tun.iface.Name()),
fmt.Sprintf("addr=%s", addr), fmt.Sprintf("addr=%s", addr),