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transport_parameters.go
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transport_parameters.go
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package minq
import (
"bytes"
"crypto/rand"
"encoding/hex"
"fmt"
"github.com/bifurcation/mint"
"github.com/bifurcation/mint/syntax"
)
const (
kQuicTransportParamtersXtn = mint.ExtensionType(0xffa5)
)
type TransportParameterId uint16
const (
kTpIdInitialMaxStreamDataBidiLocal = TransportParameterId(0x0000)
kTpIdInitialMaxData = TransportParameterId(0x0001)
kTpIdInitialMaxBidiStreams = TransportParameterId(0x0002)
kTpIdIdleTimeout = TransportParameterId(0x0003)
kTpPreferredAddress = TransportParameterId(0x0004)
kTpIdMaxPacketSize = TransportParameterId(0x0005)
kTpIdStatelessResetToken = TransportParameterId(0x0006)
kTpIdAckDelayExponent = TransportParameterId(0x0007)
kTpIdInitialMaxUniStreams = TransportParameterId(0x0008)
kTpIdDisableMigration = TransportParameterId(0x0009)
kTpIdInitialMaxStreamDataBidiRemote = TransportParameterId(0x0010)
kTpIdInitialMaxStreamDataUni = TransportParameterId(0x0011)
)
const (
kTpDefaultAckDelayExponent = byte(3)
)
type tpDef struct {
parameter TransportParameterId
val uint32
size uintptr
}
var (
kInitialMaxData = uint64(65536)
kInitialMaxStreamData = uint64(8192)
kConcurrentStreamsBidi = 16
kConcurrentStreamsUni = 16
kTransportParameterDefaults = []tpDef{
{kTpIdInitialMaxStreamDataBidiLocal, uint32(kInitialMaxStreamData), 4},
{kTpIdInitialMaxStreamDataBidiRemote, uint32(kInitialMaxStreamData), 4},
{kTpIdInitialMaxStreamDataUni, uint32(kInitialMaxStreamData), 4},
{kTpIdInitialMaxData, uint32(kInitialMaxData), 4},
{kTpIdInitialMaxBidiStreams, uint32(kConcurrentStreamsBidi), 2},
{kTpIdIdleTimeout, 5, 2},
{kTpIdInitialMaxUniStreams, uint32(kConcurrentStreamsUni), 2},
}
)
type transportParameters struct {
maxStreamDataUni uint32
maxStreamDataBidiLocal uint32
maxStreamDataBidiRemote uint32
maxData uint32
maxStreamsBidi int
maxStreamsUni int
idleTimeout uint16
ackDelayExp uint8
}
type TransportParameterList []transportParameter
type transportParameter struct {
Parameter TransportParameterId
Value []byte `tls:"head=2"`
}
type clientHelloTransportParameters struct {
InitialVersion VersionNumber
Parameters TransportParameterList `tls:"head=2"`
}
type encryptedExtensionsTransportParameters struct {
NegotiatedVersion VersionNumber
SupportedVersions []VersionNumber `tls:"head=1"`
Parameters TransportParameterList `tls:"head=2"`
}
func (tp *TransportParameterList) addUintParameter(id TransportParameterId, val uint32, size uintptr) error {
var buf bytes.Buffer
uintEncodeInt(&buf, uint64(val), size)
*tp = append(*tp, transportParameter{
id,
buf.Bytes(),
})
return nil
}
func (tp *TransportParameterList) getParameter(id TransportParameterId) []byte {
for _, ex := range *tp {
if ex.Parameter == id {
return ex.Value
}
}
return nil
}
func (tp *TransportParameterList) getUintParameter(id TransportParameterId, size uintptr) (uint32, error) {
assert(size <= 4)
b := tp.getParameter(id)
if b == nil {
logf(logTypeHandshake, "Missing transport parameter %v", id)
return 0, ErrorMissingValue
}
if len(b) != int(size) {
logf(logTypeHandshake, "Bogus transport parameter %v", id)
return 0, ErrorInvalidEncoding
}
buf := bytes.NewReader(b)
tmp, err := uintDecodeInt(buf, size)
if err != nil {
return 0, err
}
return uint32(tmp), nil
}
func (tp *TransportParameterList) getUintParameterOrDefault(id TransportParameterId, size uintptr, def uint32) (uint32, error) {
assert(size <= 4)
b := tp.getParameter(id)
if b == nil {
logf(logTypeHandshake, "Missing transport parameter %v", id)
return def, nil
}
if len(b) != int(size) {
logf(logTypeHandshake, "Bogus transport parameter %v", id)
return 0, ErrorInvalidEncoding
}
buf := bytes.NewReader(b)
tmp, err := uintDecodeInt(buf, size)
if err != nil {
return 0, err
}
return uint32(tmp), nil
}
func (tp *TransportParameterList) addOpaqueParameter(id TransportParameterId, b []byte) error {
*tp = append(*tp, transportParameter{
id,
b,
})
return nil
}
func (tp *TransportParameterList) createCommonTransportParameters() error {
for _, p := range kTransportParameterDefaults {
err := tp.addUintParameter(p.parameter, p.val, p.size)
if err != nil {
return err
}
}
return nil
}
// Implement mint.AppExtensionHandler.
type transportParametersXtnBody struct {
body []byte
}
func (t transportParametersXtnBody) Type() mint.ExtensionType {
return kQuicTransportParamtersXtn
}
func (t transportParametersXtnBody) Marshal() ([]byte, error) {
return t.body, nil
}
func (t *transportParametersXtnBody) Unmarshal(data []byte) (int, error) {
t.body = data
return len(t.body), nil
}
type transportParametersHandler struct {
log loggingFunction
role Role
version VersionNumber
peerParams *transportParameters
}
func newTransportParametersHandler(log loggingFunction, role Role, version VersionNumber) *transportParametersHandler {
return &transportParametersHandler{log, role, version, nil}
}
func (h *transportParametersHandler) setDummyPeerParams() {
h.peerParams = &transportParameters{
uint32(kInitialMaxStreamData),
uint32(kInitialMaxStreamData),
uint32(kInitialMaxStreamData),
uint32(kInitialMaxData),
kConcurrentStreamsBidi,
kConcurrentStreamsUni,
600,
uint8(1),
}
}
func (h *transportParametersHandler) Send(hs mint.HandshakeType, el *mint.ExtensionList) error {
if h.role == RoleClient {
h.log(logTypeHandshake, "Sending transport parameters")
if hs != mint.HandshakeTypeClientHello {
return nil
}
b, err := h.createClientHelloTransportParameters()
if err != nil {
return err
}
h.log(logTypeTrace, "ClientHelloTransportParameters=%s", hex.EncodeToString(b))
el.Add(&transportParametersXtnBody{b})
return nil
}
if h.peerParams == nil {
return nil
}
if hs != mint.HandshakeTypeEncryptedExtensions {
return nil
}
h.log(logTypeHandshake, "Sending transport parameters message")
b, err := h.createEncryptedExtensionsTransportParameters()
if err != nil {
return err
}
el.Add(&transportParametersXtnBody{b})
return nil
}
func (h *transportParametersHandler) Receive(hs mint.HandshakeType, el *mint.ExtensionList) error {
h.log(logTypeHandshake, "%p TransportParametersHandler message=%d", h, hs)
// First see if the other side sent the extension.
var body transportParametersXtnBody
found, err := el.Find(&body)
if err != nil {
return fmt.Errorf("Invalid transport parameters")
}
if found {
h.log(logTypeTrace, "Retrieved transport parameters len=%d %v", len(body.body), hex.EncodeToString(body.body))
}
var params *TransportParameterList
switch hs {
case mint.HandshakeTypeEncryptedExtensions:
if h.role != RoleClient {
return fmt.Errorf("EncryptedExtensions received but not a client")
}
if !found {
h.log(logTypeHandshake, "Missing transport parameters")
return fmt.Errorf("Missing transport parameters")
}
var eeParams encryptedExtensionsTransportParameters
_, err = syntax.Unmarshal(body.body, &eeParams)
if err != nil {
h.log(logTypeHandshake, "Failed to decode parameters")
return err
}
params = &eeParams.Parameters
// TODO(ekr@rtfm.com): Process version #s
case mint.HandshakeTypeClientHello:
if h.role != RoleServer {
return fmt.Errorf("ClientHello received but not a server")
}
if !found {
h.log(logTypeHandshake, "Missing transport parameters")
return fmt.Errorf("Missing transport parameters")
}
// TODO(ekr@rtfm.com): Process version #s
var chParams clientHelloTransportParameters
_, err = syntax.Unmarshal(body.body, &chParams)
if err != nil {
h.log(logTypeHandshake, "Couldn't unmarshal %v", err)
return err
}
params = &chParams.Parameters
default:
if found {
return fmt.Errorf("Received quic_transport_parameters in inappropriate message %v", hs)
}
return nil
}
// Now try to process each param.
// TODO(ekr@rtfm.com): Enforce that each param appears only once.
var tp transportParameters
h.log(logTypeHandshake, "Reading transport parameters values")
tp.maxStreamDataBidiLocal, err = params.getUintParameterOrDefault(kTpIdInitialMaxStreamDataBidiLocal, 4, 0)
if err != nil {
return err
}
tp.maxStreamDataBidiRemote, err = params.getUintParameterOrDefault(kTpIdInitialMaxStreamDataBidiRemote, 4, 0)
if err != nil {
return err
}
tp.maxStreamDataUni, err = params.getUintParameterOrDefault(kTpIdInitialMaxStreamDataUni, 4, 0)
if err != nil {
return err
}
tp.maxData, err = params.getUintParameterOrDefault(kTpIdInitialMaxData, 4, 0)
if err != nil {
return err
}
tmp, err := params.getUintParameterOrDefault(kTpIdInitialMaxBidiStreams, 2, 0)
if err != nil {
return err
}
tp.maxStreamsBidi = int(tmp)
if h.role == RoleClient {
tp.maxStreamsBidi++ // Allow for stream 0.
}
tmp, err = params.getUintParameterOrDefault(kTpIdInitialMaxUniStreams, 2, 0)
if err != nil {
return err
}
tp.maxStreamsUni = int(tmp)
tmp, err = params.getUintParameter(kTpIdIdleTimeout, 2)
if err != nil {
return err
}
tp.idleTimeout = uint16(tmp)
tmp, err = params.getUintParameterOrDefault(kTpIdAckDelayExponent, 1, 0)
if err != nil {
return err
}
h.peerParams = &tp
h.log(logTypeHandshake, "Finished reading transport parameters")
return nil
}
func (h *transportParametersHandler) createClientHelloTransportParameters() ([]byte, error) {
chtp := clientHelloTransportParameters{
h.version,
nil,
}
err := chtp.Parameters.createCommonTransportParameters()
if err != nil {
return nil, err
}
b, err := syntax.Marshal(chtp)
if err != nil {
return nil, err
}
return b, nil
}
func (h *transportParametersHandler) createEncryptedExtensionsTransportParameters() ([]byte, error) {
eetp := encryptedExtensionsTransportParameters{
h.version,
[]VersionNumber{
h.version,
},
nil,
}
err := eetp.Parameters.createCommonTransportParameters()
if err != nil {
return nil, err
}
b := make([]byte, 16)
_, err = rand.Read(b)
if err != nil {
return nil, err
}
eetp.Parameters.addOpaqueParameter(kTpIdStatelessResetToken, b)
b, err = syntax.Marshal(eetp)
if err != nil {
return nil, err
}
return b, nil
}