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(broken state) more WIP on tuntap stuff
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@ -1,18 +1,107 @@
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package tuntap
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import (
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//"github.com/yggdrasil-network/yggdrasil-go/src/address"
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"crypto/ed25519"
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"github.com/yggdrasil-network/yggdrasil-go/src/address"
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"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
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//"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
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//"golang.org/x/net/icmp"
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//"golang.org/x/net/ipv6"
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iwt "github.com/Arceliar/ironwood/types"
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"github.com/Arceliar/phony"
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)
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const TUN_OFFSET_BYTES = 4
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func (tun *TunAdapter) doRead() {
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var buf [TUN_OFFSET_BYTES + 65535]byte
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for {
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n, err := tun.iface.Read(buf[:], TUN_OFFSET_BYTES)
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if n <= TUN_OFFSET_BYTES || err != nil {
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tun.log.Errorln("Error reading TUN:", err)
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ferr := tun.iface.Flush()
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if ferr != nil {
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tun.log.Errorln("Unable to flush packets:", ferr)
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}
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return
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}
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begin := TUN_OFFSET_BYTES
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end := begin + n
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bs := buf[begin:end]
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if bs[0]&0xf0 != 0x60 {
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continue // not IPv6
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}
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if len(bs) < 40 {
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tun.log.Traceln("TUN iface read undersized ipv6 packet, length:", len(bs))
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continue
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}
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var srcAddr, dstAddr address.Address
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var srcSubnet, dstSubnet address.Subnet
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copy(srcAddr[:], bs[8:])
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copy(dstAddr[:], bs[24:])
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copy(srcSubnet[:], bs[8:])
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copy(dstSubnet[:], bs[24:])
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if srcAddr != tun.addr && srcSubnet != tun.subnet {
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continue // Wrong soruce address
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}
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if dstAddr.IsValid() {
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tun.store.sendToAddress(dstAddr, bs)
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} else if dstSubnet.IsValid() {
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tun.store.sendToSubnet(dstSubnet, bs)
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}
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}
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}
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func (tun *TunAdapter) doWrite() {
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panic("TODO")
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// Read from the packetconn
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// Get the info from the store
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// Check if addresses / subnets / etc are OK (both sides of connection)
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var buf [TUN_OFFSET_BYTES + 65535]byte
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for {
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bs := buf[TUN_OFFSET_BYTES:]
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n, from, err := tun.core.ReadFrom(bs)
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if err != nil {
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return
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}
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bs = bs[:n]
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if bs[0]&0xf0 != 0x60 {
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continue // not IPv6
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}
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if len(bs) < 40 {
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continue
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}
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var srcAddr, dstAddr address.Address
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var srcSubnet, dstSubnet address.Subnet
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copy(srcAddr[:], bs[8:])
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copy(dstAddr[:], bs[24:])
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copy(srcSubnet[:], bs[8:])
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copy(dstSubnet[:], bs[24:])
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if dstAddr != tun.addr && dstSubnet != tun.subnet {
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continue // bad local address/subnet
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}
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info := tun.store.update(ed25519.PublicKey(from.(iwt.Addr)))
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if srcAddr != info.address && srcSubnet != info.subnet {
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continue // bad remote address/subnet
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}
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bs = buf[:TUN_OFFSET_BYTES+n]
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n, err = tun.iface.Write(bs, TUN_OFFSET_BYTES)
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if err != nil {
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tun.Act(nil, func() {
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if !tun.isOpen {
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tun.log.Errorln("TUN iface write error:", err)
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}
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})
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}
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if n != len(bs) {
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// TODO some kind of error reporting for a partial write
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}
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}
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}
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type tunWriter struct {
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phony.Inbox
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tun *TunAdapter
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@ -70,6 +70,7 @@ func (k *keyStore) sendToAddress(addr address.Address, bs []byte) {
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delete(k.addrBuffer, addr)
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}
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})
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panic("TODO") // TODO send lookup
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}
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}
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@ -97,10 +98,11 @@ func (k *keyStore) sendToSubnet(subnet address.Subnet, bs []byte) {
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delete(k.subnetBuffer, subnet)
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}
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})
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panic("TODO") // TODO send lookup
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}
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}
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func (k *keyStore) update(key ed25519.PublicKey) {
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func (k *keyStore) update(key ed25519.PublicKey) *keyInfo {
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k.mutex.Lock()
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defer k.mutex.Unlock()
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var kArray keyArray
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@ -130,6 +132,7 @@ func (k *keyStore) update(key ed25519.PublicKey) {
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}
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}
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k.resetTimeout(info)
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return info
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}
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func (k *keyStore) resetTimeout(info *keyInfo) {
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@ -171,6 +171,8 @@ func (tun *TunAdapter) _start() error {
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// TODO go tun.handler()
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tun.reader.Act(nil, tun.reader._read) // Start the reader
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tun.ckr.init(tun)
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go tun.doRead()
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go tun.doWrite()
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return nil
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}
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