Act on IETF QUIC max_packet_size
After we receive the IETF QUIC max_packet_size transport parameter, we should not send packets larger than that value. This CL enforces this.
gfe-relnote: act on IETF QUIC max_packet_size, protected by disabled TLS versions
PiperOrigin-RevId: 290114223
Change-Id: I8ac886b49ae7a6099a393dbd7af1e0f765181241
diff --git a/quic/core/crypto/transport_parameters.cc b/quic/core/crypto/transport_parameters.cc
index 7e1cf44..a7df751 100644
--- a/quic/core/crypto/transport_parameters.cc
+++ b/quic/core/crypto/transport_parameters.cc
@@ -58,7 +58,6 @@
// the parameters. These come from the "Transport Parameter Definitions"
// section of draft-ietf-quic-transport.
const uint64_t kMinMaxPacketSizeTransportParam = 1200;
-const uint64_t kDefaultMaxPacketSizeTransportParam = 65527;
const uint64_t kMaxAckDelayExponentTransportParam = 20;
const uint64_t kDefaultAckDelayExponentTransportParam = 3;
const uint64_t kMaxMaxAckDelayTransportParam = 16383;
diff --git a/quic/core/quic_config.cc b/quic/core/quic_config.cc
index 86b4a97..d0087c4 100644
--- a/quic/core/quic_config.cc
+++ b/quic/core/quic_config.cc
@@ -1046,11 +1046,6 @@
if (params.max_packet_size.IsValid()) {
max_packet_size_.SetReceivedValue(params.max_packet_size.value());
- if (ReceivedMaxPacketSize() < kMaxOutgoingPacketSize) {
- // TODO(dschinazi) act on this.
- QUIC_DLOG(ERROR) << "Ignoring peer's requested max packet size of "
- << ReceivedMaxPacketSize();
- }
}
if (params.max_datagram_frame_size.IsValid()) {
diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index 4df2699..a29825b 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -311,6 +311,7 @@
connected_(true),
can_truncate_connection_ids_(perspective == Perspective::IS_SERVER),
mtu_probe_count_(0),
+ peer_max_packet_size_(kDefaultMaxPacketSizeTransportParam),
largest_received_packet_size_(0),
write_error_occurred_(false),
no_stop_waiting_frames_(
@@ -469,6 +470,11 @@
framer_.set_process_timestamps(true);
uber_received_packet_manager_.set_save_timestamps(true);
}
+ if (config.HasReceivedMaxPacketSize()) {
+ peer_max_packet_size_ = config.ReceivedMaxPacketSize();
+ packet_creator_.SetMaxPacketLength(
+ GetLimitedMaxPacketSize(peer_max_packet_size_));
+ }
supports_release_time_ =
writer_ != nullptr && writer_->SupportsReleaseTime() &&
@@ -3345,6 +3351,9 @@
if (max_packet_size > writer_limit) {
max_packet_size = writer_limit;
}
+ if (max_packet_size > peer_max_packet_size_) {
+ max_packet_size = peer_max_packet_size_;
+ }
if (max_packet_size > kMaxOutgoingPacketSize) {
max_packet_size = kMaxOutgoingPacketSize;
}
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index 9c5810a..0374cc7 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -1401,6 +1401,10 @@
// different.
QuicByteCount long_term_mtu_;
+ // The maximum UDP payload size that our peer has advertised support for.
+ // Defaults to kDefaultMaxPacketSizeTransportParam until received from peer.
+ QuicByteCount peer_max_packet_size_;
+
// The size of the largest packet received from peer.
QuicByteCount largest_received_packet_size_;
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index 8d25157..0817d57 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -2383,6 +2383,19 @@
EXPECT_EQ(1350u, connection_.max_packet_length());
}
+TEST_P(QuicConnectionTest, PeerLowersMaxPacketSize) {
+ EXPECT_EQ(Perspective::IS_CLIENT, connection_.perspective());
+
+ // SetFromConfig is always called after construction from InitializeSession.
+ EXPECT_CALL(*send_algorithm_, SetFromConfig(_, _));
+ constexpr uint32_t kTestMaxPacketSize = 1233u;
+ QuicConfig config;
+ QuicConfigPeer::SetReceivedMaxPacketSize(&config, kTestMaxPacketSize);
+ connection_.SetFromConfig(config);
+
+ EXPECT_EQ(kTestMaxPacketSize, connection_.max_packet_length());
+}
+
TEST_P(QuicConnectionTest, SmallerServerMaxPacketSize) {
TestConnection connection(TestConnectionId(), kPeerAddress, helper_.get(),
alarm_factory_.get(), writer_.get(),
diff --git a/quic/core/quic_constants.h b/quic/core/quic_constants.h
index aad6d3a..c4a83b3 100644
--- a/quic/core/quic_constants.h
+++ b/quic/core/quic_constants.h
@@ -50,6 +50,9 @@
// The maximal IETF DATAGRAM frame size we'll accept. Choosing 2^16 ensures
// that it is greater than the biggest frame we could ever fit in a QUIC packet.
const QuicByteCount kMaxAcceptedDatagramFrameSize = 65536;
+// Default value of the max_packet_size transport parameter if it is not
+// transmitted.
+const QuicByteCount kDefaultMaxPacketSizeTransportParam = 65527;
// Default maximum packet size used in the Linux TCP implementation.
// Used in QUIC for congestion window computations in bytes.
const QuicByteCount kDefaultTCPMSS = 1460;
