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tunConn cleanup

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This commit is contained in:
Arceliar
2019-08-24 11:44:21 -05:00
parent 4893a07696
commit ef15a6bd79
2 changed files with 1 additions and 206 deletions
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202
src/tuntap/conn.go
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@ -22,7 +22,6 @@ type tunConn struct {
conn *yggdrasil.Conn
addr address.Address
snet address.Subnet
send chan []byte
stop chan struct{}
alive chan struct{}
}
@ -124,98 +123,6 @@ func (s *tunConn) _read(bs []byte) (err error) {
return
}
func (s *tunConn) reader() (err error) {
select {
case _, ok := <-s.stop:
if !ok {
return errors.New("session was already closed")
}
default:
}
s.tun.log.Debugln("Starting conn reader for", s.conn.String())
defer s.tun.log.Debugln("Stopping conn reader for", s.conn.String())
for {
select {
case <-s.stop:
return nil
default:
}
var bs []byte
if bs, err = s.conn.ReadNoCopy(); err != nil {
if e, eok := err.(yggdrasil.ConnError); eok && !e.Temporary() {
if e.Closed() {
s.tun.log.Debugln(s.conn.String(), "TUN/TAP conn read debug:", err)
} else {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn read error:", err)
}
return e
}
} else if len(bs) > 0 {
ipv4 := len(bs) > 20 && bs[0]&0xf0 == 0x40
ipv6 := len(bs) > 40 && bs[0]&0xf0 == 0x60
isCGA := true
// Check source addresses
switch {
case ipv6 && bs[8] == 0x02 && bytes.Equal(s.addr[:16], bs[8:24]): // source
case ipv6 && bs[8] == 0x03 && bytes.Equal(s.snet[:8], bs[8:16]): // source
default:
isCGA = false
}
// Check destiantion addresses
switch {
case ipv6 && bs[24] == 0x02 && bytes.Equal(s.tun.addr[:16], bs[24:40]): // destination
case ipv6 && bs[24] == 0x03 && bytes.Equal(s.tun.subnet[:8], bs[24:32]): // destination
default:
isCGA = false
}
// Decide how to handle the packet
var skip bool
switch {
case isCGA: // Allowed
case s.tun.ckr.isEnabled() && (ipv4 || ipv6):
var srcAddr address.Address
var dstAddr address.Address
var addrlen int
if ipv4 {
copy(srcAddr[:], bs[12:16])
copy(dstAddr[:], bs[16:20])
addrlen = 4
}
if ipv6 {
copy(srcAddr[:], bs[8:24])
copy(dstAddr[:], bs[24:40])
addrlen = 16
}
if !s.tun.ckr.isValidLocalAddress(dstAddr, addrlen) {
// The destination address isn't in our CKR allowed range
skip = true
} else if key, err := s.tun.ckr.getPublicKeyForAddress(srcAddr, addrlen); err == nil {
srcNodeID := crypto.GetNodeID(&key)
if s.conn.RemoteAddr() == *srcNodeID {
// This is the one allowed CKR case, where source and destination addresses are both good
} else {
// The CKR key associated with this address doesn't match the sender's NodeID
skip = true
}
} else {
// We have no CKR route for this source address
skip = true
}
default:
skip = true
}
if skip {
util.PutBytes(bs)
continue
}
s.tun.send <- bs
s.stillAlive()
} else {
util.PutBytes(bs)
}
}
}
func (s *tunConn) _write(bs []byte) (err error) {
select {
case <-s.stop:
@ -320,115 +227,6 @@ func (s *tunConn) _write(bs []byte) (err error) {
return
}
func (s *tunConn) writer() error {
select {
case _, ok := <-s.stop:
if !ok {
return errors.New("session was already closed")
}
default:
}
s.tun.log.Debugln("Starting conn writer for", s.conn.String())
defer s.tun.log.Debugln("Stopping conn writer for", s.conn.String())
for {
select {
case <-s.stop:
return nil
case bs, ok := <-s.send:
if !ok {
return errors.New("send closed")
}
v4 := len(bs) > 20 && bs[0]&0xf0 == 0x40
v6 := len(bs) > 40 && bs[0]&0xf0 == 0x60
isCGA := true
// Check source addresses
switch {
case v6 && bs[8] == 0x02 && bytes.Equal(s.tun.addr[:16], bs[8:24]): // source
case v6 && bs[8] == 0x03 && bytes.Equal(s.tun.subnet[:8], bs[8:16]): // source
default:
isCGA = false
}
// Check destiantion addresses
switch {
case v6 && bs[24] == 0x02 && bytes.Equal(s.addr[:16], bs[24:40]): // destination
case v6 && bs[24] == 0x03 && bytes.Equal(s.snet[:8], bs[24:32]): // destination
default:
isCGA = false
}
// Decide how to handle the packet
var skip bool
switch {
case isCGA: // Allowed
case s.tun.ckr.isEnabled() && (v4 || v6):
var srcAddr address.Address
var dstAddr address.Address
var addrlen int
if v4 {
copy(srcAddr[:], bs[12:16])
copy(dstAddr[:], bs[16:20])
addrlen = 4
}
if v6 {
copy(srcAddr[:], bs[8:24])
copy(dstAddr[:], bs[24:40])
addrlen = 16
}
if !s.tun.ckr.isValidLocalAddress(srcAddr, addrlen) {
// The source address isn't in our CKR allowed range
skip = true
} else if key, err := s.tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
dstNodeID := crypto.GetNodeID(&key)
if s.conn.RemoteAddr() == *dstNodeID {
// This is the one allowed CKR case, where source and destination addresses are both good
} else {
// The CKR key associated with this address doesn't match the sender's NodeID
skip = true
}
} else {
// We have no CKR route for this destination address... why do we have the packet in the first place?
skip = true
}
default:
skip = true
}
if skip {
util.PutBytes(bs)
continue
}
msg := yggdrasil.FlowKeyMessage{
FlowKey: util.GetFlowKey(bs),
Message: bs,
}
if err := s.conn.WriteNoCopy(msg); err != nil {
if e, eok := err.(yggdrasil.ConnError); !eok {
if e.Closed() {
s.tun.log.Debugln(s.conn.String(), "TUN/TAP generic write debug:", err)
} else {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP generic write error:", err)
}
} else if e.PacketTooBig() {
// TODO: This currently isn't aware of IPv4 for CKR
ptb := &icmp.PacketTooBig{
MTU: int(e.PacketMaximumSize()),
Data: bs[:900],
}
if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
s.tun.send <- packet
}
} else {
if e.Closed() {
s.tun.log.Debugln(s.conn.String(), "TUN/TAP conn write debug:", err)
} else {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn write error:", err)
}
}
} else {
s.stillAlive()
}
}
}
}
func (s *tunConn) stillAlive() {
defer func() { recover() }()
select {