mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2024-11-23 18:15:24 +00:00
Try using separate workers for each TUN/TAP connection (sometimes produces duplicate packets when communicating with both the node address and a subnet address, sometimes also can't Ctrl-C to quit)
This commit is contained in:
Neil Alexander
parent
6469e39ff1
commit
5f66c4c95c
75
src/tuntap/conn.go
Normal file
75
src/tuntap/conn.go
Normal file
@ -0,0 +1,75 @@
|
||||
package tuntap
|
||||
|
||||
import (
|
||||
"errors"
|
||||
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
|
||||
)
|
||||
|
||||
type tunConn struct {
|
||||
tun *TunAdapter
|
||||
conn *yggdrasil.Conn
|
||||
send chan []byte
|
||||
stop chan interface{}
|
||||
}
|
||||
|
||||
func (s *tunConn) close() {
|
||||
close(s.stop)
|
||||
}
|
||||
|
||||
func (s *tunConn) reader() error {
|
||||
select {
|
||||
case _, ok := <-s.stop:
|
||||
if !ok {
|
||||
return errors.New("session was already closed")
|
||||
}
|
||||
default:
|
||||
}
|
||||
var n int
|
||||
var err error
|
||||
read := make(chan bool)
|
||||
b := make([]byte, 65535)
|
||||
for {
|
||||
go func() {
|
||||
if n, err = s.conn.Read(b); err != nil {
|
||||
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn read error:", err)
|
||||
return
|
||||
}
|
||||
read <- true
|
||||
}()
|
||||
select {
|
||||
case <-read:
|
||||
if n > 0 {
|
||||
s.tun.send <- b[:n]
|
||||
}
|
||||
case <-s.stop:
|
||||
s.tun.log.Debugln("Stopping conn reader for", s)
|
||||
return nil
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (s *tunConn) writer() error {
|
||||
select {
|
||||
case _, ok := <-s.stop:
|
||||
if !ok {
|
||||
return errors.New("session was already closed")
|
||||
}
|
||||
default:
|
||||
}
|
||||
for {
|
||||
select {
|
||||
case <-s.stop:
|
||||
s.tun.log.Debugln("Stopping conn writer for", s)
|
||||
return nil
|
||||
case b, ok := <-s.send:
|
||||
if !ok {
|
||||
return errors.New("send closed")
|
||||
}
|
||||
if _, err := s.conn.Write(b); err != nil {
|
||||
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn write error:", err)
|
||||
continue
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
255
src/tuntap/iface.go
Normal file
255
src/tuntap/iface.go
Normal file
@ -0,0 +1,255 @@
|
||||
package tuntap
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"errors"
|
||||
"time"
|
||||
|
||||
"github.com/songgao/packets/ethernet"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/address"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/util"
|
||||
)
|
||||
|
||||
func (tun *TunAdapter) writer() error {
|
||||
var w int
|
||||
var err error
|
||||
for {
|
||||
b := <-tun.send
|
||||
n := len(b)
|
||||
if n == 0 {
|
||||
continue
|
||||
}
|
||||
if tun.iface.IsTAP() {
|
||||
var dstAddr address.Address
|
||||
if b[0]&0xf0 == 0x60 {
|
||||
if len(b) < 40 {
|
||||
//panic("Tried to send a packet shorter than an IPv6 header...")
|
||||
util.PutBytes(b)
|
||||
continue
|
||||
}
|
||||
copy(dstAddr[:16], b[24:])
|
||||
} else if b[0]&0xf0 == 0x40 {
|
||||
if len(b) < 20 {
|
||||
//panic("Tried to send a packet shorter than an IPv4 header...")
|
||||
util.PutBytes(b)
|
||||
continue
|
||||
}
|
||||
copy(dstAddr[:4], b[16:])
|
||||
} else {
|
||||
return errors.New("Invalid address family")
|
||||
}
|
||||
sendndp := func(dstAddr address.Address) {
|
||||
neigh, known := tun.icmpv6.peermacs[dstAddr]
|
||||
known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
|
||||
if !known {
|
||||
request, err := tun.icmpv6.CreateNDPL2(dstAddr)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
if _, err := tun.iface.Write(request); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
tun.icmpv6.peermacs[dstAddr] = neighbor{
|
||||
lastsolicitation: time.Now(),
|
||||
}
|
||||
}
|
||||
}
|
||||
var peermac macAddress
|
||||
var peerknown bool
|
||||
if b[0]&0xf0 == 0x40 {
|
||||
dstAddr = tun.addr
|
||||
} else if b[0]&0xf0 == 0x60 {
|
||||
if !bytes.Equal(tun.addr[:16], dstAddr[:16]) && !bytes.Equal(tun.subnet[:8], dstAddr[:8]) {
|
||||
dstAddr = tun.addr
|
||||
}
|
||||
}
|
||||
if neighbor, ok := tun.icmpv6.peermacs[dstAddr]; ok && neighbor.learned {
|
||||
peermac = neighbor.mac
|
||||
peerknown = true
|
||||
} else if neighbor, ok := tun.icmpv6.peermacs[tun.addr]; ok && neighbor.learned {
|
||||
peermac = neighbor.mac
|
||||
peerknown = true
|
||||
sendndp(dstAddr)
|
||||
} else {
|
||||
sendndp(tun.addr)
|
||||
}
|
||||
if peerknown {
|
||||
var proto ethernet.Ethertype
|
||||
switch {
|
||||
case b[0]&0xf0 == 0x60:
|
||||
proto = ethernet.IPv6
|
||||
case b[0]&0xf0 == 0x40:
|
||||
proto = ethernet.IPv4
|
||||
}
|
||||
var frame ethernet.Frame
|
||||
frame.Prepare(
|
||||
peermac[:6], // Destination MAC address
|
||||
tun.icmpv6.mymac[:6], // Source MAC address
|
||||
ethernet.NotTagged, // VLAN tagging
|
||||
proto, // Ethertype
|
||||
len(b)) // Payload length
|
||||
copy(frame[tun_ETHER_HEADER_LENGTH:], b[:n])
|
||||
n += tun_ETHER_HEADER_LENGTH
|
||||
w, err = tun.iface.Write(frame[:n])
|
||||
}
|
||||
} else {
|
||||
w, err = tun.iface.Write(b[:n])
|
||||
}
|
||||
if err != nil {
|
||||
tun.log.Errorln("TUN/TAP iface write error:", err)
|
||||
continue
|
||||
}
|
||||
if w != n {
|
||||
tun.log.Errorln("TUN/TAP iface write mismatch:", w, "bytes written vs", n, "bytes given")
|
||||
continue
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (tun *TunAdapter) reader() error {
|
||||
bs := make([]byte, 65535)
|
||||
for {
|
||||
// Wait for a packet to be delivered to us through the TUN/TAP adapter
|
||||
n, err := tun.iface.Read(bs)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
if n == 0 {
|
||||
continue
|
||||
}
|
||||
// If it's a TAP adapter, update the buffer slice so that we no longer
|
||||
// include the ethernet headers
|
||||
offset := 0
|
||||
if tun.iface.IsTAP() {
|
||||
// Set our offset to beyond the ethernet headers
|
||||
offset = tun_ETHER_HEADER_LENGTH
|
||||
// If we detect an ICMP packet then hand it to the ICMPv6 module
|
||||
if bs[offset+6] == 58 {
|
||||
// Found an ICMPv6 packet
|
||||
b := make([]byte, n)
|
||||
copy(b, bs)
|
||||
go tun.icmpv6.ParsePacket(b)
|
||||
}
|
||||
// Then offset the buffer so that we can now just treat it as an IP
|
||||
// packet from now on
|
||||
bs = bs[offset:]
|
||||
}
|
||||
// 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 srcAddr address.Address
|
||||
var dstAddr address.Address
|
||||
var dstNodeID *crypto.NodeID
|
||||
var dstNodeIDMask *crypto.NodeID
|
||||
var dstSnet address.Subnet
|
||||
var addrlen int
|
||||
// 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 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[4])+int(bs[5])+offset+tun_IPv6_HEADER_LENGTH {
|
||||
continue
|
||||
}
|
||||
// IPv6 address
|
||||
addrlen = 16
|
||||
copy(srcAddr[:addrlen], bs[8:])
|
||||
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 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[2])+int(bs[3])+offset {
|
||||
continue
|
||||
}
|
||||
// IPv4 address
|
||||
addrlen = 4
|
||||
copy(srcAddr[:addrlen], bs[12:])
|
||||
copy(dstAddr[:addrlen], bs[16:])
|
||||
} else {
|
||||
// Unknown address length or protocol, so drop the packet and ignore it
|
||||
continue
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
// For now don't deal with any non-Yggdrasil ranges
|
||||
continue
|
||||
}
|
||||
// Do we have an active connection for this node address?
|
||||
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
|
||||
dstNodeID, dstNodeIDMask = dstAddr.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
|
||||
if conn, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
|
||||
// We've been given a connection so prepare the session wrapper
|
||||
if s, 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)
|
||||
} else {
|
||||
// Update our reference to the connection
|
||||
session, isIn = s, true
|
||||
}
|
||||
} else {
|
||||
// We weren't able to dial for some reason so there's no point in
|
||||
// continuing this iteration - skip to the next one
|
||||
continue
|
||||
}
|
||||
}
|
||||
// If we have a connection now, try writing to it
|
||||
if isIn && session != nil {
|
||||
select {
|
||||
case session.send <- bs[:n]:
|
||||
default:
|
||||
}
|
||||
}
|
||||
|
||||
/*if !r.cryptokey.isValidSource(srcAddr, addrlen) {
|
||||
// The packet had a src address that doesn't belong to us or our
|
||||
// configured crypto-key routing src subnets
|
||||
return
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
// The addresses didn't match valid Yggdrasil node addresses so let's see
|
||||
// whether it matches a crypto-key routing range instead
|
||||
if key, err := r.cryptokey.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstPubKey = &key
|
||||
dstNodeID = crypto.GetNodeID(dstPubKey)
|
||||
// Do a quick check to ensure that the node ID refers to a vaild Yggdrasil
|
||||
// address or subnet - this might be superfluous
|
||||
addr := *address.AddrForNodeID(dstNodeID)
|
||||
copy(dstAddr[:], addr[:])
|
||||
copy(dstSnet[:], addr[:])
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
return
|
||||
}
|
||||
} else {
|
||||
// No public key was found in the CKR table so we've exhausted our options
|
||||
return
|
||||
}
|
||||
}*/
|
||||
|
||||
}
|
||||
}
|
||||
@ -6,10 +6,9 @@ package tuntap
|
||||
// TODO: Set MTU of session properly
|
||||
// TODO: Reject packets that exceed session MTU with ICMPv6 for PMTU Discovery
|
||||
// TODO: Connection timeouts (call Conn.Close() when we want to time out)
|
||||
// TODO: Don't block in ifaceReader on writes that are pending searches
|
||||
// TODO: Don't block in reader on writes that are pending searches
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/hex"
|
||||
"errors"
|
||||
"fmt"
|
||||
@ -18,14 +17,12 @@ import (
|
||||
"time"
|
||||
|
||||
"github.com/gologme/log"
|
||||
"github.com/songgao/packets/ethernet"
|
||||
"github.com/yggdrasil-network/water"
|
||||
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/address"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/config"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/util"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
|
||||
)
|
||||
|
||||
@ -47,9 +44,10 @@ type TunAdapter struct {
|
||||
icmpv6 ICMPv6
|
||||
mtu int
|
||||
iface *water.Interface
|
||||
mutex sync.RWMutex // Protects the below
|
||||
addrToConn map[address.Address]*yggdrasil.Conn // Managed by connReader
|
||||
subnetToConn map[address.Subnet]*yggdrasil.Conn // Managed by connReader
|
||||
send chan []byte
|
||||
mutex sync.RWMutex // Protects the below
|
||||
addrToConn map[address.Address]*tunConn
|
||||
subnetToConn map[address.Subnet]*tunConn
|
||||
isOpen bool
|
||||
}
|
||||
|
||||
@ -112,8 +110,8 @@ func (tun *TunAdapter) Init(config *config.NodeState, log *log.Logger, listener
|
||||
tun.log = log
|
||||
tun.listener = listener
|
||||
tun.dialer = dialer
|
||||
tun.addrToConn = make(map[address.Address]*yggdrasil.Conn)
|
||||
tun.subnetToConn = make(map[address.Subnet]*yggdrasil.Conn)
|
||||
tun.addrToConn = make(map[address.Address]*tunConn)
|
||||
tun.subnetToConn = make(map[address.Subnet]*tunConn)
|
||||
}
|
||||
|
||||
// Start the setup process for the TUN/TAP adapter. If successful, starts the
|
||||
@ -148,6 +146,7 @@ func (tun *TunAdapter) Start() error {
|
||||
}
|
||||
tun.mutex.Lock()
|
||||
tun.isOpen = true
|
||||
tun.send = make(chan []byte, 32) // TODO: is this a sensible value?
|
||||
tun.mutex.Unlock()
|
||||
if iftapmode {
|
||||
go func() {
|
||||
@ -159,9 +158,7 @@ func (tun *TunAdapter) Start() error {
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
if _, err := tun.iface.Write(request); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
tun.send <- request
|
||||
time.Sleep(time.Second)
|
||||
}
|
||||
}()
|
||||
@ -173,7 +170,8 @@ func (tun *TunAdapter) Start() error {
|
||||
}
|
||||
}()
|
||||
go tun.handler()
|
||||
go tun.ifaceReader()
|
||||
go tun.reader()
|
||||
go tun.writer()
|
||||
tun.icmpv6.Init(tun)
|
||||
return nil
|
||||
}
|
||||
@ -186,473 +184,47 @@ func (tun *TunAdapter) handler() error {
|
||||
tun.log.Errorln("TUN/TAP connection accept error:", err)
|
||||
return err
|
||||
}
|
||||
go tun.connReader(conn)
|
||||
if _, 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 handler wrap:", err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (tun *TunAdapter) connReader(conn *yggdrasil.Conn) error {
|
||||
func (tun *TunAdapter) wrap(conn *yggdrasil.Conn) (c *tunConn, err error) {
|
||||
// Prepare a session wrapper for the given connection
|
||||
s := tunConn{
|
||||
tun: tun,
|
||||
conn: conn,
|
||||
send: make(chan []byte, 32), // TODO: is this a sensible value?
|
||||
stop: make(chan interface{}),
|
||||
}
|
||||
// Get the remote address and subnet of the other side
|
||||
remoteNodeID := conn.RemoteAddr()
|
||||
remoteAddr := address.AddrForNodeID(&remoteNodeID)
|
||||
remoteSubnet := address.SubnetForNodeID(&remoteNodeID)
|
||||
err := func() error {
|
||||
tun.mutex.RLock()
|
||||
defer tun.mutex.RUnlock()
|
||||
if _, isIn := tun.addrToConn[*remoteAddr]; isIn {
|
||||
return errors.New("duplicate connection for address " + net.IP(remoteAddr[:]).String())
|
||||
}
|
||||
if _, isIn := tun.subnetToConn[*remoteSubnet]; isIn {
|
||||
return errors.New("duplicate connection for subnet " + net.IP(remoteSubnet[:]).String())
|
||||
}
|
||||
return nil
|
||||
}()
|
||||
if err != nil {
|
||||
//return err
|
||||
panic(err)
|
||||
}
|
||||
// Store the connection mapped to address and subnet
|
||||
// Work out if this is already a destination we already know about
|
||||
tun.mutex.Lock()
|
||||
tun.addrToConn[*remoteAddr] = conn
|
||||
tun.subnetToConn[*remoteSubnet] = conn
|
||||
tun.mutex.Unlock()
|
||||
// Make sure to clean those up later when the connection is closed
|
||||
defer func() {
|
||||
tun.mutex.Lock()
|
||||
delete(tun.addrToConn, *remoteAddr)
|
||||
delete(tun.subnetToConn, *remoteSubnet)
|
||||
tun.mutex.Unlock()
|
||||
}()
|
||||
b := make([]byte, 65535)
|
||||
for {
|
||||
n, err := conn.Read(b)
|
||||
if err != nil {
|
||||
tun.log.Errorln(conn.String(), "TUN/TAP conn read error:", err)
|
||||
continue
|
||||
}
|
||||
if n == 0 {
|
||||
continue
|
||||
}
|
||||
var w int
|
||||
if tun.iface.IsTAP() {
|
||||
var dstAddr address.Address
|
||||
if b[0]&0xf0 == 0x60 {
|
||||
if len(b) < 40 {
|
||||
//panic("Tried to send a packet shorter than an IPv6 header...")
|
||||
util.PutBytes(b)
|
||||
continue
|
||||
}
|
||||
copy(dstAddr[:16], b[24:])
|
||||
} else if b[0]&0xf0 == 0x40 {
|
||||
if len(b) < 20 {
|
||||
//panic("Tried to send a packet shorter than an IPv4 header...")
|
||||
util.PutBytes(b)
|
||||
continue
|
||||
}
|
||||
copy(dstAddr[:4], b[16:])
|
||||
} else {
|
||||
return errors.New("Invalid address family")
|
||||
}
|
||||
sendndp := func(dstAddr address.Address) {
|
||||
neigh, known := tun.icmpv6.peermacs[dstAddr]
|
||||
known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
|
||||
if !known {
|
||||
request, err := tun.icmpv6.CreateNDPL2(dstAddr)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
if _, err := tun.iface.Write(request); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
tun.icmpv6.peermacs[dstAddr] = neighbor{
|
||||
lastsolicitation: time.Now(),
|
||||
}
|
||||
}
|
||||
}
|
||||
var peermac macAddress
|
||||
var peerknown bool
|
||||
if b[0]&0xf0 == 0x40 {
|
||||
dstAddr = tun.addr
|
||||
} else if b[0]&0xf0 == 0x60 {
|
||||
if !bytes.Equal(tun.addr[:16], dstAddr[:16]) && !bytes.Equal(tun.subnet[:8], dstAddr[:8]) {
|
||||
dstAddr = tun.addr
|
||||
}
|
||||
}
|
||||
if neighbor, ok := tun.icmpv6.peermacs[dstAddr]; ok && neighbor.learned {
|
||||
peermac = neighbor.mac
|
||||
peerknown = true
|
||||
} else if neighbor, ok := tun.icmpv6.peermacs[tun.addr]; ok && neighbor.learned {
|
||||
peermac = neighbor.mac
|
||||
peerknown = true
|
||||
sendndp(dstAddr)
|
||||
} else {
|
||||
sendndp(tun.addr)
|
||||
}
|
||||
if peerknown {
|
||||
var proto ethernet.Ethertype
|
||||
switch {
|
||||
case b[0]&0xf0 == 0x60:
|
||||
proto = ethernet.IPv6
|
||||
case b[0]&0xf0 == 0x40:
|
||||
proto = ethernet.IPv4
|
||||
}
|
||||
var frame ethernet.Frame
|
||||
frame.Prepare(
|
||||
peermac[:6], // Destination MAC address
|
||||
tun.icmpv6.mymac[:6], // Source MAC address
|
||||
ethernet.NotTagged, // VLAN tagging
|
||||
proto, // Ethertype
|
||||
len(b)) // Payload length
|
||||
copy(frame[tun_ETHER_HEADER_LENGTH:], b[:n])
|
||||
n += tun_ETHER_HEADER_LENGTH
|
||||
w, err = tun.iface.Write(frame[:n])
|
||||
}
|
||||
} else {
|
||||
w, err = tun.iface.Write(b[:n])
|
||||
}
|
||||
if err != nil {
|
||||
tun.log.Errorln(conn.String(), "TUN/TAP iface write error:", err)
|
||||
continue
|
||||
}
|
||||
if w != n {
|
||||
tun.log.Errorln(conn.String(), "TUN/TAP iface write mismatch:", w, "bytes written vs", n, "bytes given")
|
||||
continue
|
||||
}
|
||||
defer tun.mutex.Unlock()
|
||||
atc, aok := tun.addrToConn[*remoteAddr]
|
||||
stc, sok := tun.subnetToConn[*remoteSubnet]
|
||||
// If we know about a connection for this destination already then assume it
|
||||
// is no longer valid and close it
|
||||
if aok {
|
||||
atc.close()
|
||||
err = errors.New("replaced connection for address")
|
||||
} else if sok {
|
||||
stc.close()
|
||||
err = errors.New("replaced connection for subnet")
|
||||
}
|
||||
// Save the session wrapper so that we can look it up quickly next time
|
||||
// we receive a packet through the interface for this address
|
||||
tun.addrToConn[*remoteAddr] = &s
|
||||
tun.subnetToConn[*remoteSubnet] = &s
|
||||
// Start the connection goroutines
|
||||
go s.reader()
|
||||
go s.writer()
|
||||
// Return
|
||||
return c, err
|
||||
}
|
||||
|
||||
func (tun *TunAdapter) ifaceReader() error {
|
||||
bs := make([]byte, 65535)
|
||||
for {
|
||||
// Wait for a packet to be delivered to us through the TUN/TAP adapter
|
||||
n, err := tun.iface.Read(bs)
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
// If it's a TAP adapter, update the buffer slice so that we no longer
|
||||
// include the ethernet headers
|
||||
offset := 0
|
||||
if tun.iface.IsTAP() {
|
||||
// Set our offset to beyond the ethernet headers
|
||||
offset = tun_ETHER_HEADER_LENGTH
|
||||
// If we detect an ICMP packet then hand it to the ICMPv6 module
|
||||
if bs[offset+6] == 58 {
|
||||
// Found an ICMPv6 packet
|
||||
b := make([]byte, n)
|
||||
copy(b, bs)
|
||||
go tun.icmpv6.ParsePacket(b)
|
||||
}
|
||||
// Then offset the buffer so that we can now just treat it as an IP
|
||||
// packet from now on
|
||||
bs = bs[offset:]
|
||||
}
|
||||
// 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 srcAddr address.Address
|
||||
var dstAddr address.Address
|
||||
var dstNodeID *crypto.NodeID
|
||||
var dstNodeIDMask *crypto.NodeID
|
||||
var dstSnet address.Subnet
|
||||
var addrlen int
|
||||
// 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 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[4])+int(bs[5])+offset+tun_IPv6_HEADER_LENGTH {
|
||||
continue
|
||||
}
|
||||
// IPv6 address
|
||||
addrlen = 16
|
||||
copy(srcAddr[:addrlen], bs[8:])
|
||||
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 {
|
||||
continue
|
||||
}
|
||||
// Check the packet size
|
||||
if n != 256*int(bs[2])+int(bs[3])+offset {
|
||||
continue
|
||||
}
|
||||
// IPv4 address
|
||||
addrlen = 4
|
||||
copy(srcAddr[:addrlen], bs[12:])
|
||||
copy(dstAddr[:addrlen], bs[16:])
|
||||
} else {
|
||||
// Unknown address length or protocol, so drop the packet and ignore it
|
||||
continue
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
// For now don't deal with any non-Yggdrasil ranges
|
||||
continue
|
||||
}
|
||||
// Do we have an active connection for this node address?
|
||||
tun.mutex.RLock()
|
||||
conn, isIn := tun.addrToConn[dstAddr]
|
||||
if !isIn || conn == nil {
|
||||
conn, isIn = tun.subnetToConn[dstSnet]
|
||||
if !isIn || conn == nil {
|
||||
// Neither an address nor a subnet mapping matched, therefore populate
|
||||
// the node ID and mask to commence a search
|
||||
dstNodeID, dstNodeIDMask = dstAddr.GetNodeIDandMask()
|
||||
}
|
||||
}
|
||||
tun.mutex.RUnlock()
|
||||
// If we don't have a connection then we should open one
|
||||
if !isIn || conn == 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
|
||||
if c, err := tun.dialer.DialByNodeIDandMask(dstNodeID, dstNodeIDMask); err == nil {
|
||||
// We've been given a connection so start the connection reader goroutine
|
||||
go tun.connReader(c)
|
||||
// Then update our reference to the connection
|
||||
conn, isIn = c, true
|
||||
} else {
|
||||
// We weren't able to dial for some reason so there's no point in
|
||||
// continuing this iteration - skip to the next one
|
||||
continue
|
||||
}
|
||||
}
|
||||
// If we have a connection now, try writing to it
|
||||
if isIn && conn != nil {
|
||||
// If we have an open connection, either because we already had one or
|
||||
// because we opened one above, try writing the packet to it
|
||||
w, err := conn.Write(bs[:n])
|
||||
if err != nil {
|
||||
tun.log.Errorln(conn.String(), "TUN/TAP conn write error:", err)
|
||||
continue
|
||||
}
|
||||
if w != n {
|
||||
tun.log.Errorln(conn.String(), "TUN/TAP conn write mismatch:", w, "bytes written vs", n, "bytes given")
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
/*if !r.cryptokey.isValidSource(srcAddr, addrlen) {
|
||||
// The packet had a src address that doesn't belong to us or our
|
||||
// configured crypto-key routing src subnets
|
||||
return
|
||||
}
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
// The addresses didn't match valid Yggdrasil node addresses so let's see
|
||||
// whether it matches a crypto-key routing range instead
|
||||
if key, err := r.cryptokey.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
|
||||
// A public key was found, get the node ID for the search
|
||||
dstPubKey = &key
|
||||
dstNodeID = crypto.GetNodeID(dstPubKey)
|
||||
// Do a quick check to ensure that the node ID refers to a vaild Yggdrasil
|
||||
// address or subnet - this might be superfluous
|
||||
addr := *address.AddrForNodeID(dstNodeID)
|
||||
copy(dstAddr[:], addr[:])
|
||||
copy(dstSnet[:], addr[:])
|
||||
if !dstAddr.IsValid() && !dstSnet.IsValid() {
|
||||
return
|
||||
}
|
||||
} else {
|
||||
// No public key was found in the CKR table so we've exhausted our options
|
||||
return
|
||||
}
|
||||
}*/
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
// Writes a packet to the TUN/TAP adapter. If the adapter is running in TAP
|
||||
// mode then additional ethernet encapsulation is added for the benefit of the
|
||||
// host operating system.
|
||||
/*
|
||||
func (tun *TunAdapter) write() error {
|
||||
for {
|
||||
select {
|
||||
case reject := <-tun.Reject:
|
||||
switch reject.Reason {
|
||||
case yggdrasil.PacketTooBig:
|
||||
if mtu, ok := reject.Detail.(int); ok {
|
||||
// Create the Packet Too Big response
|
||||
ptb := &icmp.PacketTooBig{
|
||||
MTU: int(mtu),
|
||||
Data: reject.Packet,
|
||||
}
|
||||
|
||||
// Create the ICMPv6 response from it
|
||||
icmpv6Buf, err := CreateICMPv6(
|
||||
reject.Packet[8:24], reject.Packet[24:40],
|
||||
ipv6.ICMPTypePacketTooBig, 0, ptb)
|
||||
|
||||
// Send the ICMPv6 response back to the TUN/TAP adapter
|
||||
if err == nil {
|
||||
tun.iface.Write(icmpv6Buf)
|
||||
}
|
||||
}
|
||||
fallthrough
|
||||
default:
|
||||
continue
|
||||
}
|
||||
case data := <-tun.Recv:
|
||||
if tun.iface == nil {
|
||||
continue
|
||||
}
|
||||
if tun.iface.IsTAP() {
|
||||
var dstAddr address.Address
|
||||
if data[0]&0xf0 == 0x60 {
|
||||
if len(data) < 40 {
|
||||
//panic("Tried to send a packet shorter than an IPv6 header...")
|
||||
util.PutBytes(data)
|
||||
continue
|
||||
}
|
||||
copy(dstAddr[:16], data[24:])
|
||||
} else if data[0]&0xf0 == 0x40 {
|
||||
if len(data) < 20 {
|
||||
//panic("Tried to send a packet shorter than an IPv4 header...")
|
||||
util.PutBytes(data)
|
||||
continue
|
||||
}
|
||||
copy(dstAddr[:4], data[16:])
|
||||
} else {
|
||||
return errors.New("Invalid address family")
|
||||
}
|
||||
sendndp := func(dstAddr address.Address) {
|
||||
neigh, known := tun.icmpv6.peermacs[dstAddr]
|
||||
known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
|
||||
if !known {
|
||||
request, err := tun.icmpv6.CreateNDPL2(dstAddr)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
if _, err := tun.iface.Write(request); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
tun.icmpv6.peermacs[dstAddr] = neighbor{
|
||||
lastsolicitation: time.Now(),
|
||||
}
|
||||
}
|
||||
}
|
||||
var peermac macAddress
|
||||
var peerknown bool
|
||||
if data[0]&0xf0 == 0x40 {
|
||||
dstAddr = tun.addr
|
||||
} else if data[0]&0xf0 == 0x60 {
|
||||
if !bytes.Equal(tun.addr[:16], dstAddr[:16]) && !bytes.Equal(tun.subnet[:8], dstAddr[:8]) {
|
||||
dstAddr = tun.addr
|
||||
}
|
||||
}
|
||||
if neighbor, ok := tun.icmpv6.peermacs[dstAddr]; ok && neighbor.learned {
|
||||
peermac = neighbor.mac
|
||||
peerknown = true
|
||||
} else if neighbor, ok := tun.icmpv6.peermacs[tun.addr]; ok && neighbor.learned {
|
||||
peermac = neighbor.mac
|
||||
peerknown = true
|
||||
sendndp(dstAddr)
|
||||
} else {
|
||||
sendndp(tun.addr)
|
||||
}
|
||||
if peerknown {
|
||||
var proto ethernet.Ethertype
|
||||
switch {
|
||||
case data[0]&0xf0 == 0x60:
|
||||
proto = ethernet.IPv6
|
||||
case data[0]&0xf0 == 0x40:
|
||||
proto = ethernet.IPv4
|
||||
}
|
||||
var frame ethernet.Frame
|
||||
frame.Prepare(
|
||||
peermac[:6], // Destination MAC address
|
||||
tun.icmpv6.mymac[:6], // Source MAC address
|
||||
ethernet.NotTagged, // VLAN tagging
|
||||
proto, // Ethertype
|
||||
len(data)) // Payload length
|
||||
copy(frame[tun_ETHER_HEADER_LENGTH:], data[:])
|
||||
if _, err := tun.iface.Write(frame); err != nil {
|
||||
tun.mutex.RLock()
|
||||
open := tun.isOpen
|
||||
tun.mutex.RUnlock()
|
||||
if !open {
|
||||
return nil
|
||||
} else {
|
||||
panic(err)
|
||||
}
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if _, err := tun.iface.Write(data); err != nil {
|
||||
tun.mutex.RLock()
|
||||
open := tun.isOpen
|
||||
tun.mutex.RUnlock()
|
||||
if !open {
|
||||
return nil
|
||||
} else {
|
||||
panic(err)
|
||||
}
|
||||
}
|
||||
}
|
||||
util.PutBytes(data)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Reads any packets that are waiting on the TUN/TAP adapter. If the adapter
|
||||
// is running in TAP mode then the ethernet headers will automatically be
|
||||
// processed and stripped if necessary. If an ICMPv6 packet is found, then
|
||||
// the relevant helper functions in icmpv6.go are called.
|
||||
func (tun *TunAdapter) read() error {
|
||||
mtu := tun.mtu
|
||||
if tun.iface.IsTAP() {
|
||||
mtu += tun_ETHER_HEADER_LENGTH
|
||||
}
|
||||
buf := make([]byte, mtu)
|
||||
for {
|
||||
n, err := tun.iface.Read(buf)
|
||||
if err != nil {
|
||||
tun.mutex.RLock()
|
||||
open := tun.isOpen
|
||||
tun.mutex.RUnlock()
|
||||
if !open {
|
||||
return nil
|
||||
} else {
|
||||
return err
|
||||
}
|
||||
}
|
||||
o := 0
|
||||
if tun.iface.IsTAP() {
|
||||
o = tun_ETHER_HEADER_LENGTH
|
||||
}
|
||||
switch {
|
||||
case buf[o]&0xf0 == 0x60 && n == 256*int(buf[o+4])+int(buf[o+5])+tun_IPv6_HEADER_LENGTH+o:
|
||||
case buf[o]&0xf0 == 0x40 && n == 256*int(buf[o+2])+int(buf[o+3])+o:
|
||||
default:
|
||||
continue
|
||||
}
|
||||
if buf[o+6] == 58 {
|
||||
if tun.iface.IsTAP() {
|
||||
// Found an ICMPv6 packet
|
||||
b := make([]byte, n)
|
||||
copy(b, buf)
|
||||
go tun.icmpv6.ParsePacket(b)
|
||||
}
|
||||
}
|
||||
packet := append(util.GetBytes(), buf[o:n]...)
|
||||
tun.Send <- packet
|
||||
}
|
||||
}
|
||||
|
||||
// Closes the TUN/TAP adapter. This is only usually called when the Yggdrasil
|
||||
// process stops. Typically this operation will happen quickly, but on macOS
|
||||
// it can block until a read operation is completed.
|
||||
func (tun *TunAdapter) Close() error {
|
||||
tun.mutex.Lock()
|
||||
tun.isOpen = false
|
||||
tun.mutex.Unlock()
|
||||
if tun.iface == nil {
|
||||
return nil
|
||||
}
|
||||
return tun.iface.Close()
|
||||
}
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user