yggdrasil-network/yggdrasil-go
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TAP support added

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- Supports Windows using OpenVPN NDIS 6 TAP driver
- Supports NDP Neighbor Solicitation and Advertisements in ndp.go
- Supports TAP encapsulation and decapsulation in tun.go
This commit is contained in:
Neil Alexander 2018-01-24 10:59:01 +00:00
parent 2b7c6eafcd
commit ff55070458
4 changed files with 232 additions and 6 deletions
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35
src/yggdrasil/tun.go
View file

@ -2,7 +2,7 @@ package yggdrasil
// This manages the tun driver to send/recv packets to/from applications
// import water "github.com/songgao/water"
import ethernet "github.com/songgao/packets/ethernet"
const IPv6_HEADER_LENGTH = 40
@ -17,6 +17,7 @@ type tunInterface interface {
type tunDevice struct {
core *Core
ndp ndp
send chan<- []byte
recv <-chan []byte
mtu int
@ -25,13 +26,28 @@ type tunDevice struct {
func (tun *tunDevice) init(core *Core) {
tun.core = core
tun.ndp.init(tun)
}
func (tun *tunDevice) write() error {
for {
data := <-tun.recv
if _, err := tun.iface.Write(data); err != nil {
return err
if tun.iface.IsTAP() {
var frame ethernet.Frame
frame.Prepare(
tun.ndp.peermac[:6], // Destination MAC address
tun.ndp.mymac[:6], // Source MAC address
ethernet.NotTagged, // VLAN tagging
ethernet.IPv6, // Ethertype
len(data)) // Payload length
copy(frame[14:], data[:])
if _, err := tun.iface.Write(frame); err != nil {
return err
}
} else {
if _, err := tun.iface.Write(data); err != nil {
return err
}
}
util_putBytes(data)
}
@ -44,13 +60,20 @@ func (tun *tunDevice) read() error {
if err != nil {
return err
}
if buf[0]&0xf0 != 0x60 ||
n != 256*int(buf[4])+int(buf[5])+IPv6_HEADER_LENGTH {
o := 0
if tun.iface.IsTAP() {
o = 14
b := make([]byte, n)
copy(b, buf)
tun.ndp.recv <- b
}
if buf[o]&0xf0 != 0x60 ||
n != 256*int(buf[o+4])+int(buf[o+5])+IPv6_HEADER_LENGTH+o {
// Either not an IPv6 packet or not the complete packet for some reason
//panic("Should not happen in testing")
continue
}
packet := append(util_getBytes(), buf[:n]...)
packet := append(util_getBytes(), buf[o:n]...)
tun.send <- packet
}
}