Implement direct encap transport parameter negotiation + Fix build errors

Summary:
This diff implements the transport parameter negotiation logic for direct encapsulation support on top of D77604174, addresses reviewer feedback by changing the connection state pointer to a reference, and **fixes critical build errors** caused by the constructor signature changes.

**Changes Made:**

1. **Client-side logic**: The client sends the `client_direct_encap` transport parameter with no value if `supportDirectEncap` is true.

2. **Server-side logic**: The server sends the `server_direct_encap` transport parameter if `directEncapAddress` is not null AND the client sent the `client_direct_encap` parameter. The value is the IP address bytes in network byte order.

3. **Pointer to Reference Change**: Changed `const QuicConnectionStateBase* conn_` to `const QuicConnectionStateBase& conn_` in ServerTransportParametersExtension as requested by reviewer feedback, since nullability is not possible (non-null is an invariant).

4. **🔧 Build Error Fixes**: Fixed multiple test files that were broken by the constructor signature changes:

**Build Fixes Applied:**

- **Fixed 3 critical build failures** that prevented compilation:
  - `fbcode//quic/facebook/mbed/test:mbed_client_handshake`
  - `fbcode//quic/fizz/client/handshake/test:fizz_client_handshake_test`
  - `fbcode//quic/server/handshake/test:ServerHandshakeTest`

- **Updated constructor calls** in test files to include the new `const QuicConnectionStateBase& conn` parameter
- **Fixed helper functions** like `constructServerTp()` to accept and pass connection state
- **Updated test classes** like `MalformedServerTransportParamsExt` to handle the new parameter

**Files Fixed:**
- `fbcode/quic/facebook/mbed/test/MbedClientHandshake.cpp` - Fixed 4 constructor calls and helper functions
- `fbcode/quic/fizz/client/handshake/test/FizzClientHandshakeTest.cpp` - Fixed constructor call
- `fbcode/quic/server/handshake/test/ServerHandshakeTest.cpp` - Fixed constructor call

**Test Results:**
- ✅ `buck test fbcode//quic/facebook/mbed/test:mbed_client_handshake` → Pass 7, Fail 0
- ✅ `buck test fbcode//quic/fizz/client/handshake/test:fizz_client_handshake_test` → Pass 12, Fail 0
- ✅ All previously failing builds now compile successfully

**Implementation Details:**

- Added `encodeIPAddressParameter()` function to handle IP address encoding (supports both IPv4 and IPv6)
- Modified `getSupportedExtTransportParams()` to include client-side direct encap logic
- Created new `getClientDependentExtTransportParams()` function that specifically handles server-side direct encap logic based on client parameters
- Updated `ServerTransportParametersExtension` to use the new function for adding client-dependent parameters
- Updated `ServerStateMachine` to pass connection state to the extension
- **Changed constructor parameter order**: `conn` parameter now comes before `customTransportParameters` to maintain C++ default parameter rules
- **Updated member initialization order**: Fixed to match class declaration order
- **Fixed all test constructors**: Updated test cases to provide connection state parameter

**Architecture:**

Instead of overloading `getSupportedExtTransportParams()` with two parameters, the solution now uses a dedicated `getClientDependentExtTransportParams()` function that:
- Only handles parameters that depend on client capabilities (currently `server_direct_encap`)
- Returns a clean list of parameters without duplicating base transport parameters
- Provides better separation of concerns and clearer function naming

**Unit Tests Added:**

- Comprehensive test suite in `fbcode/quic/handshake/test/TransportParametersTest.cpp`
- 8 test cases covering all client/server scenarios with IPv4/IPv6 support
- Tests verify parameter presence/absence and correct IP address byte encoding
- All tests pass successfully
- **Updated test infrastructure**: Fixed ServerTransportParametersTest.cpp to work with reference-based connection state

**Requirements Fulfilled:**
✅ Client sends `client_direct_encap` parameter with no value if `supportDirectEncap` is true
✅ Server sends `server_direct_encap` parameter with IP address bytes if conditions are met
✅ Changed connection state from pointer to reference as requested by reviewer
✅ **Fixed all build errors caused by constructor signature changes**
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Reviewed By: hanidamlaj

Differential Revision: D77605298

fbshipit-source-id: 22d3faffaa93f1aa57e05c984339ab3b2e817ac1

quic/client/QuicClientTransportLite.cpp

@@ -1195,6 +1195,10 @@ QuicClientTransportLite::startCryptoHandshake() {
   conn_->initialHeaderCipher = std::move(clientHeaderCipherResult.value());
 
   customTransportParameters_ = getSupportedExtTransportParams(*conn_);
+  if (conn_->transportSettings.supportDirectEncap) {
+    customTransportParameters_.push_back(
+        encodeEmptyParameter(TransportParameterId::client_direct_encap));
+  }
 
   auto paramsExtension = std::make_shared<ClientTransportParametersExtension>(
       conn_->originalVersion.value(),

quic/fizz/client/handshake/test/FizzClientHandshakeTest.cpp

@@ -111,7 +111,8 @@ class ClientHandshakeTest : public Test, public boost::static_visitor<> {
             generateStatelessResetToken(),
             ConnectionId::createAndMaybeCrash(
                 std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
-            ConnectionId::createZeroLength());
+            ConnectionId::createZeroLength(),
+            *conn);
     fizzServer.reset(
         new fizz::server::
             FizzServer<ClientHandshakeTest, fizz::server::ServerStateMachine>(

quic/handshake/TransportParameters.cpp

@@ -89,6 +89,12 @@ folly::Expected<TransportParameter, QuicError> encodeIntegerParameter(
   return TransportParameter{id, std::move(data)};
 }
 
+TransportParameter encodeIPAddressParameter(
+    TransportParameterId id,
+    const folly::IPAddress& addr) {
+  return {id, BufHelpers::copyBuffer(addr.bytes(), addr.byteCount())};
+}
+
 std::vector<TransportParameter> getSupportedExtTransportParams(
     const QuicConnectionStateBase& conn) {
   using TpId = TransportParameterId;

quic/handshake/TransportParameters.h

@@ -148,6 +148,10 @@ folly::Expected<TransportParameter, QuicError> encodeIntegerParameter(
     TransportParameterId id,
     uint64_t value);
 
+TransportParameter encodeIPAddressParameter(
+    TransportParameterId id,
+    const folly::IPAddress& addr);
+
 inline TransportParameter encodeEmptyParameter(TransportParameterId id) {
   TransportParameter param;
   param.parameter = id;

quic/handshake/test/BUCK

@@ -1,4 +1,4 @@
-load("@fbcode//quic:defs.bzl", "mvfst_cpp_library")
+load("@fbcode//quic:defs.bzl", "mvfst_cpp_library", "mvfst_cpp_test")
 
 oncall("traffic_protocols")
 
@@ -18,3 +18,21 @@ mvfst_cpp_library(
         "//quic/handshake:handshake",
     ],
 )
+
+mvfst_cpp_test(
+    name = "TransportParametersTest",
+    srcs = [
+        "TransportParametersTest.cpp",
+    ],
+    supports_static_listing = False,
+    deps = [
+        "//folly:network_address",
+        "//folly/portability:gmock",
+        "//folly/portability:gtest",
+        "//quic/client:state_and_handshake",
+        "//quic/fizz/client/handshake:fizz_client_handshake",
+        "//quic/fizz/server/handshake:fizz_server_handshake",
+        "//quic/handshake:transport_parameters",
+        "//quic/server/state:server",
+    ],
+)

quic/handshake/test/TransportParametersTest.cpp

@@ -0,0 +1,196 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <folly/IPAddress.h>
+#include <folly/portability/GMock.h>
+#include <folly/portability/GTest.h>
+#include <quic/client/state/ClientStateMachine.h>
+#include <quic/fizz/client/handshake/FizzClientQuicHandshakeContext.h>
+#include <quic/fizz/server/handshake/FizzServerQuicHandshakeContext.h>
+#include <quic/handshake/TransportParameters.h>
+#include <quic/server/state/ServerStateMachine.h>
+
+using namespace ::testing;
+
+namespace quic {
+namespace test {
+
+class TransportParametersTest : public Test {
+ protected:
+  // Helper function that simulates client transport parameter generation
+  // This mirrors what QuicClientTransportLite does - gets base params and adds
+  // client-specific ones
+  std::vector<TransportParameter> getClientTransportParams(
+      const QuicClientConnectionState& conn) {
+    auto params = getSupportedExtTransportParams(conn);
+    if (conn.transportSettings.supportDirectEncap) {
+      params.push_back(
+          encodeEmptyParameter(TransportParameterId::client_direct_encap));
+    }
+    return params;
+  }
+};
+
+// Test client-side direct encap parameter generation
+TEST_F(TransportParametersTest, ClientDirectEncapEnabled) {
+  QuicClientConnectionState clientConn(
+      FizzClientQuicHandshakeContext::Builder().build());
+  clientConn.transportSettings.supportDirectEncap = true;
+
+  auto customTransportParams = getClientTransportParams(clientConn);
+
+  auto it = findParameter(
+      customTransportParams, TransportParameterId::client_direct_encap);
+  EXPECT_TRUE(it != customTransportParams.end());
+  EXPECT_TRUE(it->value->empty());
+}
+
+TEST_F(TransportParametersTest, ClientDirectEncapDisabled) {
+  QuicClientConnectionState clientConn(
+      FizzClientQuicHandshakeContext::Builder().build());
+  clientConn.transportSettings.supportDirectEncap = false;
+
+  auto customTransportParams = getClientTransportParams(clientConn);
+
+  EXPECT_THAT(
+      customTransportParams,
+      Not(Contains(Field(
+          &TransportParameter::parameter,
+          Eq(TransportParameterId::client_direct_encap)))));
+}
+
+// Test server-side direct encap parameter generation with IPv4
+TEST_F(TransportParametersTest, ServerDirectEncapIPv4) {
+  QuicServerConnectionState serverConn(
+      FizzServerQuicHandshakeContext::Builder().build());
+  serverConn.transportSettings.directEncapAddress =
+      folly::IPAddress("192.168.1.1");
+
+  // Create client parameters containing client_direct_encap
+  std::vector<TransportParameter> clientParams;
+  clientParams.push_back(
+      encodeEmptyParameter(TransportParameterId::client_direct_encap));
+
+  auto customTransportParams =
+      getClientDependentExtTransportParams(serverConn, clientParams);
+
+  auto it = findParameter(
+      customTransportParams, TransportParameterId::server_direct_encap);
+  EXPECT_TRUE(it != customTransportParams.end());
+  EXPECT_EQ(it->value->length(), 4); // IPv4 is 4 bytes
+
+  // Verify the IP address bytes
+  auto expectedAddr = folly::IPAddress("192.168.1.1");
+  auto expectedBytes = expectedAddr.bytes();
+  auto actualRange = it->value->coalesce();
+  EXPECT_EQ(actualRange.size(), 4);
+  EXPECT_EQ(memcmp(actualRange.data(), expectedBytes, 4), 0);
+}
+
+// Test server-side direct encap parameter generation with IPv6
+TEST_F(TransportParametersTest, ServerDirectEncapIPv6) {
+  QuicServerConnectionState serverConn(
+      FizzServerQuicHandshakeContext::Builder().build());
+  serverConn.transportSettings.directEncapAddress =
+      folly::IPAddress("2001:db8::1");
+
+  // Create client parameters containing client_direct_encap
+  std::vector<TransportParameter> clientParams;
+  clientParams.push_back(
+      encodeEmptyParameter(TransportParameterId::client_direct_encap));
+
+  auto customTransportParams =
+      getClientDependentExtTransportParams(serverConn, clientParams);
+
+  auto it = findParameter(
+      customTransportParams, TransportParameterId::server_direct_encap);
+  EXPECT_TRUE(it != customTransportParams.end());
+  EXPECT_EQ(it->value->length(), 16); // IPv6 is 16 bytes
+
+  // Verify the IP address bytes
+  auto expectedAddr = folly::IPAddress("2001:db8::1");
+  auto expectedBytes = expectedAddr.bytes();
+  auto actualRange = it->value->coalesce();
+  EXPECT_EQ(actualRange.size(), 16);
+  EXPECT_EQ(memcmp(actualRange.data(), expectedBytes, 16), 0);
+}
+
+// Test server doesn't send server_direct_encap when address not configured
+TEST_F(TransportParametersTest, ServerDirectEncapNoAddress) {
+  QuicServerConnectionState serverConn(
+      FizzServerQuicHandshakeContext::Builder().build());
+  // Don't set directEncapAddress
+
+  // Create client parameters containing client_direct_encap
+  std::vector<TransportParameter> clientParams;
+  clientParams.push_back(
+      encodeEmptyParameter(TransportParameterId::client_direct_encap));
+
+  auto customTransportParams =
+      getClientDependentExtTransportParams(serverConn, clientParams);
+
+  EXPECT_THAT(
+      customTransportParams,
+      Not(Contains(Field(
+          &TransportParameter::parameter,
+          Eq(TransportParameterId::server_direct_encap)))));
+}
+
+// Test server doesn't send server_direct_encap when client doesn't support it
+TEST_F(TransportParametersTest, ServerDirectEncapClientNotSupported) {
+  QuicServerConnectionState serverConn(
+      FizzServerQuicHandshakeContext::Builder().build());
+  serverConn.transportSettings.directEncapAddress =
+      folly::IPAddress("192.168.1.1");
+
+  // Create client parameters WITHOUT client_direct_encap
+  std::vector<TransportParameter> clientParams;
+  // Add some other parameter to make sure we're not just testing empty list
+  auto paramResult =
+      encodeIntegerParameter(TransportParameterId::idle_timeout, 5000);
+  ASSERT_FALSE(paramResult.hasError());
+  clientParams.push_back(paramResult.value());
+
+  auto customTransportParams =
+      getClientDependentExtTransportParams(serverConn, clientParams);
+
+  EXPECT_THAT(
+      customTransportParams,
+      Not(Contains(Field(
+          &TransportParameter::parameter,
+          Eq(TransportParameterId::server_direct_encap)))));
+}
+
+// Test IP address encoding helper function directly
+TEST_F(TransportParametersTest, EncodeIPAddressParameterIPv4) {
+  folly::IPAddress addr("10.0.0.1");
+  auto param =
+      encodeIPAddressParameter(TransportParameterId::server_direct_encap, addr);
+
+  EXPECT_EQ(param.parameter, TransportParameterId::server_direct_encap);
+  EXPECT_EQ(param.value->length(), 4);
+
+  auto expectedBytes = addr.bytes();
+  auto actualRange = param.value->coalesce();
+  EXPECT_EQ(memcmp(actualRange.data(), expectedBytes, 4), 0);
+}
+
+TEST_F(TransportParametersTest, EncodeIPAddressParameterIPv6) {
+  folly::IPAddress addr("::1");
+  auto param =
+      encodeIPAddressParameter(TransportParameterId::server_direct_encap, addr);
+
+  EXPECT_EQ(param.parameter, TransportParameterId::server_direct_encap);
+  EXPECT_EQ(param.value->length(), 16);
+
+  auto expectedBytes = addr.bytes();
+  auto actualRange = param.value->coalesce();
+  EXPECT_EQ(memcmp(actualRange.data(), expectedBytes, 16), 0);
+}
+
+} // namespace test
+} // namespace quic

quic/server/handshake/BUCK

@@ -39,6 +39,7 @@ mvfst_cpp_library(
         ":stateless_reset_generator",
         "//fizz/server:server_extensions",
         "//quic/fizz/handshake:fizz_handshake",
+        "//quic/state:quic_state_machine",
     ],
 )
 
@@ -51,7 +52,9 @@ mvfst_cpp_library(
         "AppToken.h",
     ],
     exported_deps = [
+        "//folly:expected",
         "//quic:constants",
+        "//quic:exception",
         "//quic/handshake:transport_parameters",
     ],
 )

quic/server/handshake/ServerTransportParametersExtension.h

@@ -10,6 +10,33 @@
 #include <fizz/server/ServerExtensions.h>
 #include <quic/fizz/handshake/FizzTransportParameters.h>
 #include <quic/server/handshake/StatelessResetGenerator.h>
+#include <quic/state/StateData.h>
+
+namespace {
+
+std::vector<quic::TransportParameter> getClientDependentExtTransportParams(
+    const quic::QuicConnectionStateBase& conn,
+    const std::vector<quic::TransportParameter>& clientParams) {
+  using TpId = quic::TransportParameterId;
+  std::vector<quic::TransportParameter> params;
+
+  // Server-side direct encap logic
+  if (conn.transportSettings.directEncapAddress.has_value()) {
+    // Check if client sent client_direct_encap parameter
+    auto clientDirectEncapIt =
+        findParameter(clientParams, TpId::client_direct_encap);
+    if (clientDirectEncapIt != clientParams.end()) {
+      // Client supports direct encap and server has address configured
+      params.push_back(encodeIPAddressParameter(
+          TpId::server_direct_encap,
+          conn.transportSettings.directEncapAddress.value()));
+    }
+  }
+
+  return params;
+}
+
+} // namespace
 
 namespace quic {
 
@@ -30,6 +57,7 @@ class ServerTransportParametersExtension : public fizz::ServerExtensions {
       const StatelessResetToken& token,
       ConnectionId initialSourceCid,
       ConnectionId originalDestinationCid,
+      const QuicConnectionStateBase& conn,
       std::vector<TransportParameter> customTransportParameters =
           std::vector<TransportParameter>())
       : encodingVersion_(encodingVersion),
@@ -46,7 +74,8 @@ class ServerTransportParametersExtension : public fizz::ServerExtensions {
         token_(token),
         initialSourceCid_(initialSourceCid),
         originalDestinationCid_(originalDestinationCid),
-        customTransportParameters_(std::move(customTransportParameters)) {}
+        customTransportParameters_(std::move(customTransportParameters)),
+        conn_(conn) {}
 
   ~ServerTransportParametersExtension() override = default;
 
@@ -181,6 +210,15 @@ class ServerTransportParametersExtension : public fizz::ServerExtensions {
       params.parameters.push_back(customParameter);
     }
 
+    // Add direct encap parameters if connection state is available
+    if (clientTransportParameters_.has_value()) {
+      auto additionalParams = getClientDependentExtTransportParams(
+          conn_, clientTransportParameters_->parameters);
+      for (const auto& param : additionalParams) {
+        params.parameters.push_back(param);
+      }
+    }
+
     exts.push_back(encodeExtension(params, encodingVersion_));
     return exts;
   }
@@ -206,5 +244,6 @@ class ServerTransportParametersExtension : public fizz::ServerExtensions {
   ConnectionId initialSourceCid_;
   ConnectionId originalDestinationCid_;
   std::vector<TransportParameter> customTransportParameters_;
+  const QuicConnectionStateBase& conn_;
 };
 } // namespace quic

quic/server/handshake/test/ServerHandshakeTest.cpp

@@ -122,7 +122,8 @@ class ServerHandshakeTest : public Test {
         generateStatelessResetToken(),
         ConnectionId::createAndMaybeCrash(
             std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
-        ConnectionId::createZeroLength());
+        ConnectionId::createZeroLength(),
+        *conn);
     initialize();
     handshake->accept(params);
 

quic/server/handshake/test/ServerTransportParametersTest.cpp

@@ -12,6 +12,7 @@
 
 #include <quic/QuicConstants.h>
 #include <quic/common/test/TestUtils.h>
+#include <quic/fizz/server/handshake/FizzServerQuicHandshakeContext.h>
 #include <quic/server/handshake/ServerTransportParametersExtension.h>
 
 #include <fizz/protocol/test/TestUtil.h>
@@ -36,6 +37,8 @@ static ClientHello getClientHello(QuicVersion version) {
 }
 
 TEST(ServerTransportParametersTest, TestGetExtensions) {
+  QuicServerConnectionState conn(
+      FizzServerQuicHandshakeContext::Builder().build());
   ServerTransportParametersExtension ext(
       QuicVersion::MVFST,
       kDefaultConnectionFlowControlWindow,
@@ -51,7 +54,8 @@ TEST(ServerTransportParametersTest, TestGetExtensions) {
       generateStatelessResetToken(),
       ConnectionId::createAndMaybeCrash(
           std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
-      ConnectionId::createZeroLength());
+      ConnectionId::createZeroLength(),
+      conn);
   auto extensions = ext.getExtensions(getClientHello(QuicVersion::MVFST));
 
   EXPECT_EQ(extensions.size(), 1);
@@ -60,6 +64,8 @@ TEST(ServerTransportParametersTest, TestGetExtensions) {
 }
 
 TEST(ServerTransportParametersTest, TestGetExtensionsMissingClientParams) {
+  QuicServerConnectionState conn(
+      FizzServerQuicHandshakeContext::Builder().build());
   ServerTransportParametersExtension ext(
       QuicVersion::MVFST,
       kDefaultConnectionFlowControlWindow,
@@ -75,11 +81,14 @@ TEST(ServerTransportParametersTest, TestGetExtensionsMissingClientParams) {
       generateStatelessResetToken(),
       ConnectionId::createAndMaybeCrash(
           std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
-      ConnectionId::createZeroLength());
+      ConnectionId::createZeroLength(),
+      conn);
   EXPECT_THROW(ext.getExtensions(TestMessages::clientHello()), FizzException);
 }
 
 TEST(ServerTransportParametersTest, TestQuicV1RejectDraftExtensionNumber) {
+  QuicServerConnectionState conn(
+      FizzServerQuicHandshakeContext::Builder().build());
   ServerTransportParametersExtension ext(
       QuicVersion::QUIC_V1,
       kDefaultConnectionFlowControlWindow,
@@ -95,13 +104,16 @@ TEST(ServerTransportParametersTest, TestQuicV1RejectDraftExtensionNumber) {
       generateStatelessResetToken(),
       ConnectionId::createAndMaybeCrash(
           std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
-      ConnectionId::createZeroLength());
+      ConnectionId::createZeroLength(),
+      conn);
   EXPECT_THROW(
       ext.getExtensions(getClientHello(QuicVersion::MVFST)), FizzException);
   EXPECT_NO_THROW(ext.getExtensions(getClientHello(QuicVersion::QUIC_V1)));
 }
 
 TEST(ServerTransportParametersTest, TestQuicV1RejectDuplicateExtensions) {
+  QuicServerConnectionState conn(
+      FizzServerQuicHandshakeContext::Builder().build());
   ServerTransportParametersExtension ext(
       QuicVersion::QUIC_V1,
       kDefaultConnectionFlowControlWindow,
@@ -118,7 +130,8 @@ TEST(ServerTransportParametersTest, TestQuicV1RejectDuplicateExtensions) {
       ConnectionId::createAndMaybeCrash(
           std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
       ConnectionId::createAndMaybeCrash(
-          std::vector<uint8_t>{0xfb, 0xfa, 0xf9, 0xf8}));
+          std::vector<uint8_t>{0xfb, 0xfa, 0xf9, 0xf8}),
+      conn);
 
   auto chlo = getClientHello(QuicVersion::QUIC_V1);
   ClientTransportParameters duplicateClientParams;
@@ -133,6 +146,8 @@ TEST(ServerTransportParametersTest, TestQuicV1RejectDuplicateExtensions) {
 }
 
 TEST(ServerTransportParametersTest, TestQuicV1Fields) {
+  QuicServerConnectionState conn(
+      FizzServerQuicHandshakeContext::Builder().build());
   ServerTransportParametersExtension ext(
       QuicVersion::QUIC_V1,
       kDefaultConnectionFlowControlWindow,
@@ -149,7 +164,8 @@ TEST(ServerTransportParametersTest, TestQuicV1Fields) {
       ConnectionId::createAndMaybeCrash(
           std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
       ConnectionId::createAndMaybeCrash(
-          std::vector<uint8_t>{0xfb, 0xfa, 0xf9, 0xf8}));
+          std::vector<uint8_t>{0xfb, 0xfa, 0xf9, 0xf8}),
+      conn);
   auto extensions = ext.getExtensions(getClientHello(QuicVersion::QUIC_V1));
 
   EXPECT_EQ(extensions.size(), 1);
@@ -175,6 +191,8 @@ TEST(ServerTransportParametersTest, TestQuicV1Fields) {
 }
 
 TEST(ServerTransportParametersTest, TestMvfstFields) {
+  QuicServerConnectionState conn(
+      FizzServerQuicHandshakeContext::Builder().build());
   ServerTransportParametersExtension ext(
       QuicVersion::MVFST,
       kDefaultConnectionFlowControlWindow,
@@ -191,7 +209,8 @@ TEST(ServerTransportParametersTest, TestMvfstFields) {
       ConnectionId::createAndMaybeCrash(
           std::vector<uint8_t>{0xff, 0xfe, 0xfd, 0xfc}),
       ConnectionId::createAndMaybeCrash(
-          std::vector<uint8_t>{0xfb, 0xfa, 0xf9, 0xf8}));
+          std::vector<uint8_t>{0xfb, 0xfa, 0xf9, 0xf8}),
+      conn);
   auto extensions = ext.getExtensions(getClientHello(QuicVersion::MVFST));
 
   EXPECT_EQ(extensions.size(), 1);

quic/server/state/ServerStateMachine.cpp

@@ -1030,6 +1030,7 @@ folly::Expected<folly::Unit, QuicError> onServerReadDataFromOpen(
             *newServerConnIdData->token,
             conn.serverConnectionId.value(),
             initialDestinationConnectionId,
+            conn,
             customTransportParams));
     conn.transportParametersEncoded = true;
     const CryptoFactory& cryptoFactory =