mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-10 06:20:26 +00:00
start migrating the TunAdapter to the actor model
This commit is contained in:
Arceliar
parent
502f2937a9
commit
aaf34c6304
@ -113,8 +113,7 @@ func (s *tunConn) _read(bs []byte) (err error) {
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util.PutBytes(bs)
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return
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}
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// FIXME this send can block if the tuntap isn't running, which isn't really safe...
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s.tun.send <- bs
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s.tun.writer.writeFrom(s, bs)
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s.stillAlive()
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return
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}
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@ -208,7 +207,7 @@ func (s *tunConn) _write(bs []byte) (err error) {
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Data: bs[:900],
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}
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if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
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s.tun.send <- packet
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s.tun.writer.writeFrom(s, packet)
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}
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} else {
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if e.Closed() {
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@ -9,264 +9,279 @@ import (
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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/util"
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"github.com/Arceliar/phony"
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)
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func (tun *TunAdapter) writer() error {
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var w int
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type tunWriter struct {
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phony.Inbox
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tun *TunAdapter
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}
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func (w *tunWriter) writeFrom(from phony.Actor, b []byte) {
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w.RecvFrom(from, func() {
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w._write(b)
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})
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}
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// write is pretty loose with the memory safety rules, e.g. it assumes it can read w.tun.iface.IsTap() safely
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func (w *tunWriter) _write(b []byte) {
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var written int
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var err error
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for {
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b := <-tun.send
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n := len(b)
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if n == 0 {
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continue
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}
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if tun.iface.IsTAP() {
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sendndp := func(dstAddr address.Address) {
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neigh, known := tun.icmpv6.getNeighbor(dstAddr)
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known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
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if !known {
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tun.icmpv6.Solicit(dstAddr)
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}
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}
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peermac := net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
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var dstAddr address.Address
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var peerknown bool
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if b[0]&0xf0 == 0x40 {
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dstAddr = tun.addr
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} else if b[0]&0xf0 == 0x60 {
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if !bytes.Equal(tun.addr[:16], dstAddr[:16]) && !bytes.Equal(tun.subnet[:8], dstAddr[:8]) {
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dstAddr = tun.addr
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}
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}
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if neighbor, ok := tun.icmpv6.getNeighbor(dstAddr); ok && neighbor.learned {
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// If we've learned the MAC of a 300::/7 address, for example, or a CKR
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// address, use the MAC address of that
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peermac = neighbor.mac
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peerknown = true
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} else if neighbor, ok := tun.icmpv6.getNeighbor(tun.addr); ok && neighbor.learned {
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// Otherwise send directly to the MAC address of the host if that's
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// known instead
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peermac = neighbor.mac
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peerknown = true
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} else {
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// Nothing has been discovered, try to discover the destination
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sendndp(tun.addr)
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}
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if peerknown {
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var proto ethernet.Ethertype
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switch {
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case b[0]&0xf0 == 0x60:
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proto = ethernet.IPv6
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case b[0]&0xf0 == 0x40:
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proto = ethernet.IPv4
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}
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var frame ethernet.Frame
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frame.Prepare(
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peermac[:6], // Destination MAC address
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tun.icmpv6.mymac[:6], // Source MAC address
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ethernet.NotTagged, // VLAN tagging
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proto, // Ethertype
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len(b)) // Payload length
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copy(frame[tun_ETHER_HEADER_LENGTH:], b[:n])
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n += tun_ETHER_HEADER_LENGTH
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w, err = tun.iface.Write(frame[:n])
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} else {
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tun.log.Errorln("TUN/TAP iface write error: no peer MAC known for", net.IP(dstAddr[:]).String(), "- dropping packet")
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}
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} else {
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w, err = tun.iface.Write(b[:n])
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util.PutBytes(b)
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}
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if err != nil {
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if !tun.isOpen {
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return err
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}
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tun.log.Errorln("TUN/TAP iface write error:", err)
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continue
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}
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if w != n {
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tun.log.Errorln("TUN/TAP iface write mismatch:", w, "bytes written vs", n, "bytes given")
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continue
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}
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n := len(b)
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if n == 0 {
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return
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}
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}
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// Run in a separate goroutine by the reader
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// Does all of the per-packet ICMP checks, passes packets to the right Conn worker
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func (tun *TunAdapter) readerPacketHandler(ch chan []byte) {
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for recvd := range ch {
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// If it's a TAP adapter, update the buffer slice so that we no longer
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// include the ethernet headers
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offset := 0
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if tun.iface.IsTAP() {
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// Set our offset to beyond the ethernet headers
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offset = tun_ETHER_HEADER_LENGTH
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// Check first of all that we can go beyond the ethernet headers
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if len(recvd) <= offset {
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continue
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if w.tun.iface.IsTAP() {
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sendndp := func(dstAddr address.Address) {
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neigh, known := w.tun.icmpv6.getNeighbor(dstAddr)
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known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
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if !known {
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w.tun.icmpv6.Solicit(dstAddr)
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}
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}
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// Offset the buffer from now on so that we can ignore ethernet frames if
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// they are present
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bs := recvd[offset:]
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// If we detect an ICMP packet then hand it to the ICMPv6 module
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if bs[6] == 58 {
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// Found an ICMPv6 packet - we need to make sure to give ICMPv6 the full
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// Ethernet frame rather than just the IPv6 packet as this is needed for
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// NDP to work correctly
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if err := tun.icmpv6.ParsePacket(recvd); err == nil {
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// We acted on the packet in the ICMPv6 module so don't forward or do
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// anything else with it
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continue
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}
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}
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if offset != 0 {
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// Shift forward to avoid leaking bytes off the front of the slice when we eventually store it
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bs = append(recvd[:0], bs...)
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}
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// From the IP header, work out what our source and destination addresses
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// and node IDs are. We will need these in order to work out where to send
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// the packet
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peermac := net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
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var dstAddr address.Address
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var dstSnet address.Subnet
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var addrlen int
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n := len(bs)
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// Check the IP protocol - if it doesn't match then we drop the packet and
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// do nothing with it
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if bs[0]&0xf0 == 0x60 {
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// Check if we have a fully-sized IPv6 header
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if len(bs) < 40 {
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continue
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var peerknown bool
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if b[0]&0xf0 == 0x40 {
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dstAddr = w.tun.addr
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} else if b[0]&0xf0 == 0x60 {
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if !bytes.Equal(w.tun.addr[:16], dstAddr[:16]) && !bytes.Equal(w.tun.subnet[:8], dstAddr[:8]) {
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dstAddr = w.tun.addr
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}
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// Check the packet size
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if n-tun_IPv6_HEADER_LENGTH != 256*int(bs[4])+int(bs[5]) {
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continue
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}
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// IPv6 address
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addrlen = 16
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copy(dstAddr[:addrlen], bs[24:])
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copy(dstSnet[:addrlen/2], bs[24:])
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} else if bs[0]&0xf0 == 0x40 {
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// Check if we have a fully-sized IPv4 header
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if len(bs) < 20 {
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continue
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}
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// Check the packet size
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if n != 256*int(bs[2])+int(bs[3]) {
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continue
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}
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// IPv4 address
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addrlen = 4
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copy(dstAddr[:addrlen], bs[16:])
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}
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if neighbor, ok := w.tun.icmpv6.getNeighbor(dstAddr); ok && neighbor.learned {
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// If we've learned the MAC of a 300::/7 address, for example, or a CKR
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// address, use the MAC address of that
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peermac = neighbor.mac
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peerknown = true
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} else if neighbor, ok := w.tun.icmpv6.getNeighbor(w.tun.addr); ok && neighbor.learned {
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// Otherwise send directly to the MAC address of the host if that's
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// known instead
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peermac = neighbor.mac
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peerknown = true
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} else {
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// Unknown address length or protocol, so drop the packet and ignore it
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tun.log.Traceln("Unknown packet type, dropping")
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continue
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// Nothing has been discovered, try to discover the destination
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sendndp(w.tun.addr)
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}
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if tun.ckr.isEnabled() {
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if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
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if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
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// A public key was found, get the node ID for the search
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dstNodeID := crypto.GetNodeID(&key)
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dstAddr = *address.AddrForNodeID(dstNodeID)
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dstSnet = *address.SubnetForNodeID(dstNodeID)
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addrlen = 16
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}
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if peerknown {
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var proto ethernet.Ethertype
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switch {
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case b[0]&0xf0 == 0x60:
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proto = ethernet.IPv6
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case b[0]&0xf0 == 0x40:
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proto = ethernet.IPv4
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}
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var frame ethernet.Frame
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frame.Prepare(
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peermac[:6], // Destination MAC address
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w.tun.icmpv6.mymac[:6], // Source MAC address
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ethernet.NotTagged, // VLAN tagging
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proto, // Ethertype
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len(b)) // Payload length
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copy(frame[tun_ETHER_HEADER_LENGTH:], b[:n])
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n += tun_ETHER_HEADER_LENGTH
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written, err = w.tun.iface.Write(frame[:n])
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} else {
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w.tun.log.Errorln("TUN/TAP iface write error: no peer MAC known for", net.IP(dstAddr[:]).String(), "- dropping packet")
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}
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if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
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// Couldn't find this node's ygg IP
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continue
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}
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// Do we have an active connection for this node address?
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var dstNodeID, dstNodeIDMask *crypto.NodeID
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tun.mutex.RLock()
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session, isIn := tun.addrToConn[dstAddr]
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if !isIn || session == nil {
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session, isIn = tun.subnetToConn[dstSnet]
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if !isIn || session == nil {
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// Neither an address nor a subnet mapping matched, therefore populate
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// the node ID and mask to commence a search
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if dstAddr.IsValid() {
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dstNodeID, dstNodeIDMask = dstAddr.GetNodeIDandMask()
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} else {
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dstNodeID, dstNodeIDMask = dstSnet.GetNodeIDandMask()
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}
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}
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}
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tun.mutex.RUnlock()
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// If we don't have a connection then we should open one
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if !isIn || session == nil {
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// Check we haven't been given empty node ID, really this shouldn't ever
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// happen but just to be sure...
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if dstNodeID == nil || dstNodeIDMask == nil {
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panic("Given empty dstNodeID and dstNodeIDMask - this shouldn't happen")
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}
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// Dial to the remote node
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go func() {
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// FIXME just spitting out a goroutine to do this is kind of ugly and means we drop packets until the dial finishes
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tun.mutex.Lock()
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_, known := tun.dials[*dstNodeID]
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tun.dials[*dstNodeID] = append(tun.dials[*dstNodeID], bs)
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for len(tun.dials[*dstNodeID]) > 32 {
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util.PutBytes(tun.dials[*dstNodeID][0])
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tun.dials[*dstNodeID] = tun.dials[*dstNodeID][1:]
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}
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tun.mutex.Unlock()
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if known {
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return
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}
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var tc *tunConn
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if conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
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// We've been given a connection so prepare the session wrapper
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if tc, err = tun.wrap(conn); err != nil {
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// Something went wrong when storing the connection, typically that
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// something already exists for this address or subnet
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tun.log.Debugln("TUN/TAP iface wrap:", err)
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}
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}
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tun.mutex.Lock()
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packets := tun.dials[*dstNodeID]
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delete(tun.dials, *dstNodeID)
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tun.mutex.Unlock()
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if tc != nil {
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for _, packet := range packets {
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p := packet // Possibly required because of how range
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<-tc.SyncExec(func() { tc._write(p) })
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}
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}
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}()
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// While the dial is going on we can't do much else
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// continuing this iteration - skip to the next one
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continue
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}
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// If we have a connection now, try writing to it
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if isIn && session != nil {
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<-session.SyncExec(func() { session._write(bs) })
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} else {
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written, err = w.tun.iface.Write(b[:n])
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util.PutBytes(b)
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}
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if err != nil {
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w.tun.mutex.Lock()
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open := w.tun.isOpen
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w.tun.mutex.Unlock()
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if !open {
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return
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}
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w.tun.log.Errorln("TUN/TAP iface write error:", err)
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}
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if written != n {
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w.tun.log.Errorln("TUN/TAP iface write mismatch:", written, "bytes written vs", n, "bytes given")
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}
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}
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func (tun *TunAdapter) reader() error {
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toWorker := make(chan []byte, 32)
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defer close(toWorker)
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go tun.readerPacketHandler(toWorker)
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for {
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// Get a slice to store the packet in
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recvd := util.ResizeBytes(util.GetBytes(), 65535+tun_ETHER_HEADER_LENGTH)
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// Wait for a packet to be delivered to us through the TUN/TAP adapter
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n, err := tun.iface.Read(recvd)
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if err != nil {
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if !tun.isOpen {
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return err
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}
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panic(err)
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}
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if n == 0 {
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util.PutBytes(recvd)
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continue
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}
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// Send the packet to the worker
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toWorker <- recvd[:n]
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type tunReader struct {
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phony.Inbox
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tun *TunAdapter
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}
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func (r *tunReader) _read() {
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// Get a slice to store the packet in
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recvd := util.ResizeBytes(util.GetBytes(), 65535+tun_ETHER_HEADER_LENGTH)
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// Wait for a packet to be delivered to us through the TUN/TAP adapter
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n, err := r.tun.iface.Read(recvd)
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if n == 0 {
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util.PutBytes(recvd)
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} else {
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r.tun.handlePacketFrom(r, recvd[:n], err)
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}
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if err == nil {
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// Now read again
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r.RecvFrom(nil, r._read)
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}
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}
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func (tun *TunAdapter) handlePacketFrom(from phony.Actor, packet []byte, err error) {
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tun.RecvFrom(from, func() {
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tun._handlePacket(packet, err)
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})
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}
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// does the work of reading a packet and sending it to the correct tunConn
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func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
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if err != nil {
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tun.log.Errorln("TUN/TAP iface read error:", err)
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return
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}
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// If it's a TAP adapter, update the buffer slice so that we no longer
|
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// include the ethernet headers
|
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offset := 0
|
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if tun.iface.IsTAP() {
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// Set our offset to beyond the ethernet headers
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offset = tun_ETHER_HEADER_LENGTH
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// Check first of all that we can go beyond the ethernet headers
|
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if len(recvd) <= offset {
|
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return
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}
|
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}
|
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// Offset the buffer from now on so that we can ignore ethernet frames if
|
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// they are present
|
||||
bs := recvd[offset:]
|
||||
// If we detect an ICMP packet then hand it to the ICMPv6 module
|
||||
if bs[6] == 58 {
|
||||
// Found an ICMPv6 packet - we need to make sure to give ICMPv6 the full
|
||||
// Ethernet frame rather than just the IPv6 packet as this is needed for
|
||||
// NDP to work correctly
|
||||
if err := tun.icmpv6.ParsePacket(recvd); err == nil {
|
||||
// We acted on the packet in the ICMPv6 module so don't forward or do
|
||||
// anything else with it
|
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return
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}
|
||||
}
|
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if offset != 0 {
|
||||
// Shift forward to avoid leaking bytes off the front of the slice when we eventually store it
|
||||
bs = append(recvd[:0], bs...)
|
||||
}
|
||||
// From the IP header, work out what our source and destination addresses
|
||||
// and node IDs are. We will need these in order to work out where to send
|
||||
// the packet
|
||||
var dstAddr address.Address
|
||||
var dstSnet address.Subnet
|
||||
var addrlen int
|
||||
n := len(bs)
|
||||
// Check the IP protocol - if it doesn't match then we drop the packet and
|
||||
// do nothing with it
|
||||
if bs[0]&0xf0 == 0x60 {
|
||||
// Check if we have a fully-sized IPv6 header
|
||||
if len(bs) < 40 {
|
||||
return
|
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}
|
||||
// Check the packet size
|
||||
if n-tun_IPv6_HEADER_LENGTH != 256*int(bs[4])+int(bs[5]) {
|
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return
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}
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||||
// IPv6 address
|
||||
addrlen = 16
|
||||
copy(dstAddr[:addrlen], bs[24:])
|
||||
copy(dstSnet[:addrlen/2], bs[24:])
|
||||
} else if bs[0]&0xf0 == 0x40 {
|
||||
// Check if we have a fully-sized IPv4 header
|
||||
if len(bs) < 20 {
|
||||
return
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[2])+int(bs[3]) {
|
||||
return
|
||||
}
|
||||
// IPv4 address
|
||||
addrlen = 4
|
||||
copy(dstAddr[:addrlen], bs[16:])
|
||||
} else {
|
||||
// Unknown address length or protocol, so drop the packet and ignore it
|
||||
tun.log.Traceln("Unknown packet type, dropping")
|
||||
return
|
||||
}
|
||||
if tun.ckr.isEnabled() {
|
||||
if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
|
||||
if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstNodeID := crypto.GetNodeID(&key)
|
||||
dstAddr = *address.AddrForNodeID(dstNodeID)
|
||||
dstSnet = *address.SubnetForNodeID(dstNodeID)
|
||||
addrlen = 16
|
||||
}
|
||||
}
|
||||
}
|
||||
if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
|
||||
// Couldn't find this node's ygg IP
|
||||
return
|
||||
}
|
||||
// Do we have an active connection for this node address?
|
||||
var dstNodeID, dstNodeIDMask *crypto.NodeID
|
||||
tun.mutex.RLock()
|
||||
session, isIn := tun.addrToConn[dstAddr]
|
||||
if !isIn || session == nil {
|
||||
session, isIn = tun.subnetToConn[dstSnet]
|
||||
if !isIn || session == nil {
|
||||
// Neither an address nor a subnet mapping matched, therefore populate
|
||||
// the node ID and mask to commence a search
|
||||
if dstAddr.IsValid() {
|
||||
dstNodeID, dstNodeIDMask = dstAddr.GetNodeIDandMask()
|
||||
} else {
|
||||
dstNodeID, dstNodeIDMask = dstSnet.GetNodeIDandMask()
|
||||
}
|
||||
}
|
||||
}
|
||||
tun.mutex.RUnlock()
|
||||
// If we don't have a connection then we should open one
|
||||
if !isIn || session == nil {
|
||||
// Check we haven't been given empty node ID, really this shouldn't ever
|
||||
// happen but just to be sure...
|
||||
if dstNodeID == nil || dstNodeIDMask == nil {
|
||||
panic("Given empty dstNodeID and dstNodeIDMask - this shouldn't happen")
|
||||
}
|
||||
// Dial to the remote node
|
||||
go func() {
|
||||
// FIXME just spitting out a goroutine to do this is kind of ugly and means we drop packets until the dial finishes
|
||||
tun.mutex.Lock()
|
||||
_, known := tun.dials[*dstNodeID]
|
||||
tun.dials[*dstNodeID] = append(tun.dials[*dstNodeID], bs)
|
||||
for len(tun.dials[*dstNodeID]) > 32 {
|
||||
util.PutBytes(tun.dials[*dstNodeID][0])
|
||||
tun.dials[*dstNodeID] = tun.dials[*dstNodeID][1:]
|
||||
}
|
||||
tun.mutex.Unlock()
|
||||
if known {
|
||||
return
|
||||
}
|
||||
var tc *tunConn
|
||||
if conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
|
||||
// We've been given a connection so prepare the session wrapper
|
||||
if tc, err = tun.wrap(conn); err != nil {
|
||||
// Something went wrong when storing the connection, typically that
|
||||
// something already exists for this address or subnet
|
||||
tun.log.Debugln("TUN/TAP iface wrap:", err)
|
||||
}
|
||||
}
|
||||
tun.mutex.Lock()
|
||||
packets := tun.dials[*dstNodeID]
|
||||
delete(tun.dials, *dstNodeID)
|
||||
tun.mutex.Unlock()
|
||||
if tc != nil {
|
||||
for _, packet := range packets {
|
||||
p := packet // Possibly required because of how range
|
||||
<-tc.SyncExec(func() { tc._write(p) })
|
||||
}
|
||||
}
|
||||
}()
|
||||
// While the dial is going on we can't do much else
|
||||
return
|
||||
}
|
||||
// If we have a connection now, try writing to it
|
||||
if isIn && session != nil {
|
||||
session.RecvFrom(tun, func() { session._write(bs) })
|
||||
}
|
||||
}
|
||||
|
||||
@ -15,6 +15,7 @@ import (
|
||||
"net"
|
||||
"sync"
|
||||
|
||||
"github.com/Arceliar/phony"
|
||||
"github.com/gologme/log"
|
||||
"github.com/yggdrasil-network/water"
|
||||
|
||||
@ -33,6 +34,8 @@ const tun_ETHER_HEADER_LENGTH = 14
|
||||
// you should pass this object to the yggdrasil.SetRouterAdapter() function
|
||||
// before calling yggdrasil.Start().
|
||||
type TunAdapter struct {
|
||||
writer tunWriter
|
||||
reader tunReader
|
||||
config *config.NodeState
|
||||
log *log.Logger
|
||||
reconfigure chan chan error
|
||||
@ -44,7 +47,7 @@ type TunAdapter struct {
|
||||
icmpv6 ICMPv6
|
||||
mtu int
|
||||
iface *water.Interface
|
||||
send chan []byte
|
||||
phony.Inbox // Currently only used for _handlePacket from the reader, TODO: all the stuff that currently needs a mutex below
|
||||
mutex sync.RWMutex // Protects the below
|
||||
addrToConn map[address.Address]*tunConn
|
||||
subnetToConn map[address.Subnet]*tunConn
|
||||
@ -114,6 +117,8 @@ func (tun *TunAdapter) Init(config *config.NodeState, log *log.Logger, listener
|
||||
tun.addrToConn = make(map[address.Address]*tunConn)
|
||||
tun.subnetToConn = make(map[address.Subnet]*tunConn)
|
||||
tun.dials = make(map[crypto.NodeID][][]byte)
|
||||
tun.writer.tun = tun
|
||||
tun.reader.tun = tun
|
||||
}
|
||||
|
||||
// Start the setup process for the TUN/TAP adapter. If successful, starts the
|
||||
@ -147,7 +152,6 @@ func (tun *TunAdapter) Start() error {
|
||||
}
|
||||
tun.mutex.Lock()
|
||||
tun.isOpen = true
|
||||
tun.send = make(chan []byte, 32) // TODO: is this a sensible value?
|
||||
tun.reconfigure = make(chan chan error)
|
||||
tun.mutex.Unlock()
|
||||
go func() {
|
||||
@ -157,8 +161,7 @@ func (tun *TunAdapter) Start() error {
|
||||
}
|
||||
}()
|
||||
go tun.handler()
|
||||
go tun.reader()
|
||||
go tun.writer()
|
||||
tun.reader.RecvFrom(nil, tun.reader._read) // Start the reader
|
||||
tun.icmpv6.Init(tun)
|
||||
if iftapmode {
|
||||
go tun.icmpv6.Solicit(tun.addr)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user