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mostly finish migration of IP stuff to core, tuntap is still responsible for ICMP PacketTooBig

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This commit is contained in:
Arceliar 2021-06-13 04:54:06 -05:00
parent 1147ee1934
commit 816356ea65
7 changed files with 114 additions and 185 deletions
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25
src/core/api.go
View File

@ -222,3 +222,28 @@ func (c *Core) RemovePeer(addr string, sintf string) error {
func (c *Core) CallPeer(u *url.URL, sintf string) error {
return c.links.call(u, sintf)
}
func (c *Core) PublicKey() ed25519.PublicKey {
return c.public
}
func (c *Core) MaxMTU() uint64 {
return c.store.maxSessionMTU()
}
// Implement io.ReadWriteCloser
func (c *Core) Read(p []byte) (n int, err error) {
n, err = c.store.readPC(p)
return
}
func (c *Core) Write(p []byte) (n int, err error) {
n, err = c.store.writePC(p)
return
}
func (c *Core) Close() error {
c.Stop()
return nil
}

31
src/core/core.go
View File

@ -5,6 +5,7 @@ import (
"crypto/ed25519"
"encoding/hex"
"errors"
"fmt"
"io/ioutil"
"net/url"
"time"
@ -25,13 +26,13 @@ type Core struct {
// We're going to keep our own copy of the provided config - that way we can
// guarantee that it will be covered by the mutex
phony.Inbox
pc *iw.PacketConn
pc *iw.PacketConn
config *config.NodeConfig // Config
secret ed25519.PrivateKey
public ed25519.PublicKey
links links
proto protoHandler
store keyStore
proto protoHandler
store keyStore
log *log.Logger
addPeerTimer *time.Timer
ctx context.Context
@ -43,13 +44,13 @@ func (c *Core) _init() error {
// Init sets up structs
// Start launches goroutines that depend on structs being set up
// This is pretty much required to completely avoid race conditions
c.config.RLock()
defer c.config.RUnlock()
if c.log == nil {
c.log = log.New(ioutil.Discard, "", 0)
}
c.config.RLock()
sigPriv, err := hex.DecodeString(c.config.PrivateKey)
c.config.RUnlock()
if err != nil {
return err
}
@ -65,6 +66,9 @@ func (c *Core) _init() error {
c.ctx, c.ctxCancel = context.WithCancel(context.Background())
c.store.init(c)
c.proto.init(c)
if err := c.proto.nodeinfo.setNodeInfo(c.config.NodeInfo, c.config.NodeInfoPrivacy); err != nil {
return fmt.Errorf("setNodeInfo: %w", err)
}
return err
}
@ -177,20 +181,3 @@ func (c *Core) _stop() {
*/
c.log.Infoln("Stopped")
}
// Implement io.ReadWriteCloser
func (c *Core) Read(p []byte) (n int, err error) {
n, err = c.store.readPC(p)
return
}
func (c *Core) Write(p []byte) (n int, err error) {
n, err = c.store.writePC(p)
return
}
func (c *Core) Close() error {
c.Stop()
return nil
}

124
src/core/keystore.go
View File

@ -17,7 +17,7 @@ const keyStoreTimeout = 2 * time.Minute
type keyArray [ed25519.PublicKeySize]byte
type keyStore struct {
core *Core
core *Core
address address.Address
subnet address.Subnet
mutex sync.Mutex
@ -26,7 +26,6 @@ type keyStore struct {
addrBuffer map[address.Address]*buffer
subnetToInfo map[address.Subnet]*keyInfo
subnetBuffer map[address.Subnet]*buffer
buf []byte // scratch space to prefix with typeSessionTraffic before sending
}
type keyInfo struct {
@ -45,7 +44,10 @@ func (k *keyStore) init(core *Core) {
k.core = core
k.address = *address.AddrForKey(k.core.public)
k.subnet = *address.SubnetForKey(k.core.public)
k.core.pc.SetOutOfBandHandler(k.oobHandler)
if err := k.core.pc.SetOutOfBandHandler(k.oobHandler); err != nil {
err = fmt.Errorf("tun.core.SetOutOfBandHander: %w", err)
panic(err)
}
k.keyToInfo = make(map[keyArray]*keyInfo)
k.addrToInfo = make(map[address.Address]*keyInfo)
k.addrBuffer = make(map[address.Address]*buffer)
@ -204,38 +206,39 @@ func (k *keyStore) maxSessionMTU() uint64 {
}
func (k *keyStore) readPC(p []byte) (int, error) {
for {
bs := p
n, from, err := k.core.pc.ReadFrom(bs)
if err != nil {
return n, err
}
if n == 0 {
continue
}
switch bs[0] {
case typeSessionTraffic:
// This is what we want to handle here
case typeSessionProto:
var key keyArray
copy(key[:], from.(iwt.Addr))
data := append([]byte(nil), bs[1:n]...)
k.core.proto.handleProto(nil, key, data)
continue
default:
continue
}
bs = bs[1:n]
if len(bs) == 0 {
continue
}
if bs[0]&0xf0 != 0x60 {
continue // not IPv6
}
if len(bs) < 40 {
continue
}
/* TODO ICMP packet too big
buf := make([]byte, k.core.pc.MTU(), 65535)
for {
bs := buf
n, from, err := k.core.pc.ReadFrom(bs)
if err != nil {
return n, err
}
if n == 0 {
continue
}
switch bs[0] {
case typeSessionTraffic:
// This is what we want to handle here
case typeSessionProto:
var key keyArray
copy(key[:], from.(iwt.Addr))
data := append([]byte(nil), bs[1:n]...)
k.core.proto.handleProto(nil, key, data)
continue
default:
continue
}
bs = bs[1:n]
if len(bs) == 0 {
continue
}
if bs[0]&0xf0 != 0x60 {
continue // not IPv6
}
if len(bs) < 40 {
continue
}
/* TODO? ICMP packet too big, for now tuntap sends this when needed
if len(bs) > int(tun.MTU()) {
ptb := &icmp.PacketTooBig{
MTU: int(tun.mtu),
@ -246,32 +249,32 @@ func (k *keyStore) readPC(p []byte) (int, error) {
}
continue
}
*/
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
copy(srcAddr[:], bs[8:])
copy(dstAddr[:], bs[24:])
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if dstAddr != k.address && dstSubnet != k.subnet {
continue // bad local address/subnet
}
info := k.update(ed25519.PublicKey(from.(iwt.Addr)))
if srcAddr != info.address && srcSubnet != info.subnet {
continue // bad remote address/subnet
}
n = copy(p, bs)
return n, nil
*/
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
copy(srcAddr[:], bs[8:])
copy(dstAddr[:], bs[24:])
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if dstAddr != k.address && dstSubnet != k.subnet {
continue // bad local address/subnet
}
info := k.update(ed25519.PublicKey(from.(iwt.Addr)))
if srcAddr != info.address && srcSubnet != info.subnet {
continue // bad remote address/subnet
}
n = copy(p, bs)
return n, nil
}
}
func (k *keyStore) writePC(bs []byte) (int, error) {
if bs[0]&0xf0 != 0x60 {
if bs[0]&0xf0 != 0x60 {
return 0, errors.New("not an IPv6 packet") // not IPv6
}
if len(bs) < 40 {
strErr := fmt.Sprint("undersized IPv6 packet, length:", len(bs))
return 0, errors.New(strErr)
strErr := fmt.Sprint("undersized IPv6 packet, length:", len(bs))
return 0, errors.New(strErr)
}
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
@ -280,16 +283,17 @@ func (k *keyStore) writePC(bs []byte) (int, error) {
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if srcAddr != k.address && srcSubnet != k.subnet {
return 0, errors.New("wrong source address")
return 0, errors.New("wrong source address")
}
k.buf = append(k.buf[:0], typeSessionTraffic)
k.buf = append(k.buf, bs...)
buf := make([]byte, 1+len(bs), 65535)
buf[0] = typeSessionTraffic
copy(buf[1:], bs)
if dstAddr.IsValid() {
k.sendToAddress(dstAddr, k.buf)
k.sendToAddress(dstAddr, buf)
} else if dstSubnet.IsValid() {
k.sendToSubnet(dstSubnet, k.buf)
k.sendToSubnet(dstSubnet, buf)
} else {
return 0, errors.New("invalid destination address")
return 0, errors.New("invalid destination address")
}
return len(bs), nil
}

2
src/core/proto.go
View File

@ -31,7 +31,7 @@ type reqInfo struct {
type protoHandler struct {
phony.Inbox
core *Core
core *Core
nodeinfo nodeinfo
sreqs map[keyArray]*reqInfo
preqs map[keyArray]*reqInfo

8
src/tuntap/admin.go
View File

@ -34,8 +34,8 @@ func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
}
return res, nil
})
_ = a.AddHandler("getNodeInfo", []string{"key"}, t.proto.nodeinfo.nodeInfoAdminHandler)
_ = a.AddHandler("debug_remoteGetSelf", []string{"key"}, t.proto.getSelfHandler)
_ = a.AddHandler("debug_remoteGetPeers", []string{"key"}, t.proto.getPeersHandler)
_ = a.AddHandler("debug_remoteGetDHT", []string{"key"}, t.proto.getDHTHandler)
//_ = a.AddHandler("getNodeInfo", []string{"key"}, t.proto.nodeinfo.nodeInfoAdminHandler)
//_ = a.AddHandler("debug_remoteGetSelf", []string{"key"}, t.proto.getSelfHandler)
//_ = a.AddHandler("debug_remoteGetPeers", []string{"key"}, t.proto.getPeersHandler)
//_ = a.AddHandler("debug_remoteGetDHT", []string{"key"}, t.proto.getDHTHandler)
}

88
src/tuntap/iface.go
View File

@ -1,20 +1,8 @@
package tuntap
import (
"crypto/ed25519"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv6"
//"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
//"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
//"golang.org/x/net/icmp"
//"golang.org/x/net/ipv6"
iwt "github.com/Arceliar/ironwood/types"
//"github.com/Arceliar/phony"
)
const TUN_OFFSET_BYTES = 4
@ -34,28 +22,8 @@ func (tun *TunAdapter) read() {
begin := TUN_OFFSET_BYTES
end := begin + n
bs := buf[begin:end]
if bs[0]&0xf0 != 0x60 {
continue // not IPv6
}
if len(bs) < 40 {
tun.log.Traceln("TUN iface read undersized ipv6 packet, length:", len(bs))
continue
}
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
copy(srcAddr[:], bs[8:])
copy(dstAddr[:], bs[24:])
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if srcAddr != tun.addr && srcSubnet != tun.subnet {
continue // Wrong source address
}
bs = buf[begin-1 : end]
bs[0] = typeSessionTraffic
if dstAddr.IsValid() {
tun.store.sendToAddress(dstAddr, bs)
} else if dstSubnet.IsValid() {
tun.store.sendToSubnet(dstSubnet, bs)
if _, err := tun.core.Write(bs); err != nil {
tun.log.Errorln("Unable to send packet:", err)
}
}
}
@ -63,63 +31,23 @@ func (tun *TunAdapter) read() {
func (tun *TunAdapter) write() {
var buf [TUN_OFFSET_BYTES + 65535]byte
for {
bs := buf[TUN_OFFSET_BYTES-1:]
n, from, err := tun.core.ReadFrom(bs)
bs := buf[TUN_OFFSET_BYTES:]
n, err := tun.core.Read(bs)
if err != nil {
tun.log.Errorln("Exiting tun writer due to core read error:", err)
return
}
if n == 0 {
continue
}
switch bs[0] {
case typeSessionTraffic:
// This is what we want to handle here
if !tun.isEnabled {
continue // Drop traffic if the tun is disabled
}
case typeSessionProto:
var key keyArray
copy(key[:], from.(iwt.Addr))
data := append([]byte(nil), bs[1:n]...)
tun.proto.handleProto(nil, key, data)
continue
default:
continue
}
bs = bs[1:n]
if len(bs) == 0 {
continue
}
if bs[0]&0xf0 != 0x60 {
continue // not IPv6
}
if len(bs) < 40 {
continue
}
if len(bs) > int(tun.MTU()) {
if n > int(tun.MTU()) {
ptb := &icmp.PacketTooBig{
MTU: int(tun.mtu),
Data: bs[:40],
}
if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
_, _ = tun.core.WriteTo(packet, from)
_, _ = tun.core.Write(packet)
}
continue
}
var srcAddr, dstAddr address.Address
var srcSubnet, dstSubnet address.Subnet
copy(srcAddr[:], bs[8:])
copy(dstAddr[:], bs[24:])
copy(srcSubnet[:], bs[8:])
copy(dstSubnet[:], bs[24:])
if dstAddr != tun.addr && dstSubnet != tun.subnet {
continue // bad local address/subnet
}
info := tun.store.update(ed25519.PublicKey(from.(iwt.Addr)))
if srcAddr != info.address && srcSubnet != info.subnet {
continue // bad remote address/subnet
}
bs = buf[:TUN_OFFSET_BYTES+len(bs)]
bs = buf[:TUN_OFFSET_BYTES+n]
if _, err = tun.iface.Write(bs, TUN_OFFSET_BYTES); err != nil {
tun.Act(nil, func() {
if !tun.isOpen {

21
src/tuntap/tun.go
View File

@ -9,7 +9,6 @@ package tuntap
// TODO: Don't block in reader on writes that are pending searches
import (
"crypto/ed25519"
"errors"
"fmt"
"net"
@ -34,7 +33,6 @@ type MTU uint16
// calling yggdrasil.Start().
type TunAdapter struct {
core *core.Core
store keyStore
config *config.NodeConfig
log *log.Logger
addr address.Address
@ -45,7 +43,6 @@ type TunAdapter struct {
//mutex sync.RWMutex // Protects the below
isOpen bool
isEnabled bool // Used by the writer to drop sessionTraffic if not enabled
proto protoHandler
}
// Gets the maximum supported MTU for the platform based on the defaults in
@ -98,18 +95,8 @@ func MaximumMTU() uint64 {
// the Yggdrasil core before this point and it must not be in use elsewhere.
func (tun *TunAdapter) Init(core *core.Core, config *config.NodeConfig, log *log.Logger, options interface{}) error {
tun.core = core
tun.store.init(tun)
tun.config = config
tun.log = log
tun.proto.init(tun)
tun.config.RLock()
if err := tun.proto.nodeinfo.setNodeInfo(tun.config.NodeInfo, tun.config.NodeInfoPrivacy); err != nil {
return fmt.Errorf("tun.proto.nodeinfo.setNodeInfo: %w", err)
}
tun.config.RUnlock()
if err := tun.core.SetOutOfBandHandler(tun.oobHandler); err != nil {
return fmt.Errorf("tun.core.SetOutOfBandHander: %w", err)
}
return nil
}
@ -132,8 +119,7 @@ func (tun *TunAdapter) _start() error {
if tun.config == nil {
return errors.New("no configuration available to TUN")
}
sk := tun.core.PrivateKey()
pk := sk.Public().(ed25519.PublicKey)
pk := tun.core.PublicKey()
tun.addr = *address.AddrForKey(pk)
tun.subnet = *address.SubnetForKey(pk)
addr := fmt.Sprintf("%s/%d", net.IP(tun.addr[:]).String(), 8*len(address.GetPrefix())-1)
@ -144,8 +130,8 @@ func (tun *TunAdapter) _start() error {
return nil
}
mtu := tun.config.IfMTU
if tun.maxSessionMTU() < mtu {
mtu = tun.maxSessionMTU()
if tun.core.MaxMTU() < mtu {
mtu = tun.core.MaxMTU()
}
if err := tun.setup(tun.config.IfName, addr, mtu); err != nil {
return err
@ -188,4 +174,3 @@ func (tun *TunAdapter) _stop() error {
}
return nil
}