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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "net/dcsctp/socket/stream_reset_handler.h"
#include <array>
#include <cstdint>
#include <memory>
#include <type_traits>
#include <vector>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/task_queue/task_queue_base.h"
#include "net/dcsctp/common/handover_testing.h"
#include "net/dcsctp/common/internal_types.h"
#include "net/dcsctp/packet/chunk/forward_tsn_common.h"
#include "net/dcsctp/packet/chunk/reconfig_chunk.h"
#include "net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.h"
#include "net/dcsctp/packet/parameter/outgoing_ssn_reset_request_parameter.h"
#include "net/dcsctp/packet/parameter/parameter.h"
#include "net/dcsctp/packet/parameter/reconfiguration_response_parameter.h"
#include "net/dcsctp/public/dcsctp_message.h"
#include "net/dcsctp/public/types.h"
#include "net/dcsctp/rx/data_tracker.h"
#include "net/dcsctp/rx/reassembly_queue.h"
#include "net/dcsctp/socket/mock_context.h"
#include "net/dcsctp/socket/mock_dcsctp_socket_callbacks.h"
#include "net/dcsctp/testing/data_generator.h"
#include "net/dcsctp/testing/testing_macros.h"
#include "net/dcsctp/timer/timer.h"
#include "net/dcsctp/tx/mock_send_queue.h"
#include "net/dcsctp/tx/retransmission_queue.h"
#include "rtc_base/gunit.h"
#include "test/gmock.h"
namespace dcsctp {
namespace {
using ::testing::IsEmpty;
using ::testing::NiceMock;
using ::testing::Property;
using ::testing::Return;
using ::testing::SizeIs;
using ::testing::UnorderedElementsAre;
using ::webrtc::TimeDelta;
using ResponseResult = ReconfigurationResponseParameter::Result;
using SkippedStream = AnyForwardTsnChunk::SkippedStream;
constexpr TSN kMyInitialTsn = MockContext::MyInitialTsn();
constexpr ReconfigRequestSN kMyInitialReqSn = ReconfigRequestSN(*kMyInitialTsn);
constexpr TSN kPeerInitialTsn = MockContext::PeerInitialTsn();
constexpr ReconfigRequestSN kPeerInitialReqSn =
ReconfigRequestSN(*kPeerInitialTsn);
constexpr uint32_t kArwnd = 131072;
constexpr TimeDelta kRto = TimeDelta::Millis(250);
constexpr std::array<uint8_t, 4> kShortPayload = {1, 2, 3, 4};
MATCHER_P3(SctpMessageIs, stream_id, ppid, expected_payload, "") {
if (arg.stream_id() != stream_id) {
*result_listener << "the stream_id is " << *arg.stream_id();
return false;
}
if (arg.ppid() != ppid) {
*result_listener << "the ppid is " << *arg.ppid();
return false;
}
if (std::vector<uint8_t>(arg.payload().begin(), arg.payload().end()) !=
std::vector<uint8_t>(expected_payload.begin(), expected_payload.end())) {
*result_listener << "the payload is wrong";
return false;
}
return true;
}
TSN AddTo(TSN tsn, int delta) {
return TSN(*tsn + delta);
}
ReconfigRequestSN AddTo(ReconfigRequestSN req_sn, int delta) {
return ReconfigRequestSN(*req_sn + delta);
}
class StreamResetHandlerTest : public testing::Test {
protected:
StreamResetHandlerTest()
: ctx_(&callbacks_),
timer_manager_([this](webrtc::TaskQueueBase::DelayPrecision precision) {
return callbacks_.CreateTimeout(precision);
}),
delayed_ack_timer_(timer_manager_.CreateTimer(
"test/delayed_ack",
[]() { return TimeDelta::Zero(); },
TimerOptions(TimeDelta::Zero()))),
t3_rtx_timer_(timer_manager_.CreateTimer(
"test/t3_rtx",
[]() { return TimeDelta::Zero(); },
TimerOptions(TimeDelta::Zero()))),
data_tracker_(std::make_unique<DataTracker>("log: ",
delayed_ack_timer_.get(),
kPeerInitialTsn)),
reasm_(std::make_unique<ReassemblyQueue>("log: ", kArwnd)),
retransmission_queue_(std::make_unique<RetransmissionQueue>(
"",
&callbacks_,
kMyInitialTsn,
kArwnd,
producer_,
[](TimeDelta rtt) {},
[]() {},
*t3_rtx_timer_,
DcSctpOptions())),
handler_(
std::make_unique<StreamResetHandler>("log: ",
&ctx_,
&timer_manager_,
data_tracker_.get(),
reasm_.get(),
retransmission_queue_.get())) {
EXPECT_CALL(ctx_, current_rto).WillRepeatedly(Return(kRto));
}
void AdvanceTime(TimeDelta duration) {
callbacks_.AdvanceTime(duration);
for (;;) {
absl::optional<TimeoutID> timeout_id = callbacks_.GetNextExpiredTimeout();
if (!timeout_id.has_value()) {
break;
}
timer_manager_.HandleTimeout(*timeout_id);
}
}
// Handles the passed in RE-CONFIG `chunk` and returns the responses
// that are sent in the response RE-CONFIG.
std::vector<ReconfigurationResponseParameter> HandleAndCatchResponse(
ReConfigChunk chunk) {
handler_->HandleReConfig(std::move(chunk));
std::vector<uint8_t> payload = callbacks_.ConsumeSentPacket();
if (payload.empty()) {
EXPECT_TRUE(false);
return {};
}
std::vector<ReconfigurationResponseParameter> responses;
absl::optional<SctpPacket> p = SctpPacket::Parse(payload, DcSctpOptions());
if (!p.has_value()) {
EXPECT_TRUE(false);
return {};
}
if (p->descriptors().size() != 1) {
EXPECT_TRUE(false);
return {};
}
absl::optional<ReConfigChunk> response_chunk =
ReConfigChunk::Parse(p->descriptors()[0].data);
if (!response_chunk.has_value()) {
EXPECT_TRUE(false);
return {};
}
for (const auto& desc : response_chunk->parameters().descriptors()) {
if (desc.type == ReconfigurationResponseParameter::kType) {
absl::optional<ReconfigurationResponseParameter> response =
ReconfigurationResponseParameter::Parse(desc.data);
if (!response.has_value()) {
EXPECT_TRUE(false);
return {};
}
responses.emplace_back(*std::move(response));
}
}
return responses;
}
void PerformHandover() {
EXPECT_TRUE(handler_->GetHandoverReadiness().IsReady());
EXPECT_TRUE(data_tracker_->GetHandoverReadiness().IsReady());
EXPECT_TRUE(reasm_->GetHandoverReadiness().IsReady());
EXPECT_TRUE(retransmission_queue_->GetHandoverReadiness().IsReady());
DcSctpSocketHandoverState state;
handler_->AddHandoverState(state);
data_tracker_->AddHandoverState(state);
reasm_->AddHandoverState(state);
retransmission_queue_->AddHandoverState(state);
g_handover_state_transformer_for_test(&state);
data_tracker_ = std::make_unique<DataTracker>(
"log: ", delayed_ack_timer_.get(), kPeerInitialTsn);
data_tracker_->RestoreFromState(state);
reasm_ = std::make_unique<ReassemblyQueue>("log: ", kArwnd);
reasm_->RestoreFromState(state);
retransmission_queue_ = std::make_unique<RetransmissionQueue>(
"", &callbacks_, kMyInitialTsn, kArwnd, producer_, [](TimeDelta rtt) {},
[]() {}, *t3_rtx_timer_, DcSctpOptions(),
/*supports_partial_reliability=*/true,
/*use_message_interleaving=*/false);
retransmission_queue_->RestoreFromState(state);
handler_ = std::make_unique<StreamResetHandler>(
"log: ", &ctx_, &timer_manager_, data_tracker_.get(), reasm_.get(),
retransmission_queue_.get(), &state);
}
DataGenerator gen_;
NiceMock<MockDcSctpSocketCallbacks> callbacks_;
NiceMock<MockContext> ctx_;
NiceMock<MockSendQueue> producer_;
TimerManager timer_manager_;
std::unique_ptr<Timer> delayed_ack_timer_;
std::unique_ptr<Timer> t3_rtx_timer_;
std::unique_ptr<DataTracker> data_tracker_;
std::unique_ptr<ReassemblyQueue> reasm_;
std::unique_ptr<RetransmissionQueue> retransmission_queue_;
std::unique_ptr<StreamResetHandler> handler_;
};
TEST_F(StreamResetHandlerTest, ChunkWithNoParametersReturnsError) {
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(0);
EXPECT_CALL(callbacks_, OnError).Times(1);
handler_->HandleReConfig(ReConfigChunk(Parameters()));
}
TEST_F(StreamResetHandlerTest, ChunkWithInvalidParametersReturnsError) {
Parameters::Builder builder;
// Two OutgoingSSNResetRequestParameter in a RE-CONFIG is not valid.
builder.Add(OutgoingSSNResetRequestParameter(ReconfigRequestSN(1),
ReconfigRequestSN(10),
kPeerInitialTsn, {StreamID(1)}));
builder.Add(OutgoingSSNResetRequestParameter(ReconfigRequestSN(2),
ReconfigRequestSN(10),
kPeerInitialTsn, {StreamID(2)}));
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(0);
EXPECT_CALL(callbacks_, OnError).Times(1);
handler_->HandleReConfig(ReConfigChunk(builder.Build()));
}
TEST_F(StreamResetHandlerTest, FailToDeliverWithoutResettingStream) {
reasm_->Add(kPeerInitialTsn, gen_.Ordered({1, 2, 3, 4}, "BE"));
reasm_->Add(AddTo(kPeerInitialTsn, 1), gen_.Ordered({1, 2, 3, 4}, "BE"));
data_tracker_->Observe(kPeerInitialTsn);
data_tracker_->Observe(AddTo(kPeerInitialTsn, 1));
EXPECT_THAT(reasm_->FlushMessages(),
UnorderedElementsAre(
SctpMessageIs(StreamID(1), PPID(53), kShortPayload),
SctpMessageIs(StreamID(1), PPID(53), kShortPayload)));
gen_.ResetStream();
reasm_->Add(AddTo(kPeerInitialTsn, 2), gen_.Ordered({1, 2, 3, 4}, "BE"));
EXPECT_THAT(reasm_->FlushMessages(), IsEmpty());
}
TEST_F(StreamResetHandlerTest, ResetStreamsNotDeferred) {
reasm_->Add(kPeerInitialTsn, gen_.Ordered({1, 2, 3, 4}, "BE"));
reasm_->Add(AddTo(kPeerInitialTsn, 1), gen_.Ordered({1, 2, 3, 4}, "BE"));
data_tracker_->Observe(kPeerInitialTsn);
data_tracker_->Observe(AddTo(kPeerInitialTsn, 1));
EXPECT_THAT(reasm_->FlushMessages(),
UnorderedElementsAre(
SctpMessageIs(StreamID(1), PPID(53), kShortPayload),
SctpMessageIs(StreamID(1), PPID(53), kShortPayload)));
Parameters::Builder builder;
builder.Add(OutgoingSSNResetRequestParameter(
kPeerInitialReqSn, ReconfigRequestSN(3), AddTo(kPeerInitialTsn, 1),
{StreamID(1)}));
std::vector<ReconfigurationResponseParameter> responses =
HandleAndCatchResponse(ReConfigChunk(builder.Build()));
EXPECT_THAT(responses, SizeIs(1));
EXPECT_EQ(responses[0].result(), ResponseResult::kSuccessPerformed);
gen_.ResetStream();
reasm_->Add(AddTo(kPeerInitialTsn, 2), gen_.Ordered({1, 2, 3, 4}, "BE"));
EXPECT_THAT(reasm_->FlushMessages(),
UnorderedElementsAre(
SctpMessageIs(StreamID(1), PPID(53), kShortPayload)));
}
TEST_F(StreamResetHandlerTest, ResetStreamsDeferred) {
constexpr StreamID kStreamId = StreamID(1);
data_tracker_->Observe(TSN(10));
reasm_->Add(TSN(10), gen_.Ordered({1, 2, 3, 4}, "BE", {.mid = MID(0)}));
data_tracker_->Observe(TSN(11));
reasm_->Add(TSN(11), gen_.Ordered({1, 2, 3, 4}, "BE", {.mid = MID(1)}));
EXPECT_THAT(
reasm_->FlushMessages(),
UnorderedElementsAre(SctpMessageIs(kStreamId, PPID(53), kShortPayload),
SctpMessageIs(kStreamId, PPID(53), kShortPayload)));
Parameters::Builder builder;
builder.Add(OutgoingSSNResetRequestParameter(
ReconfigRequestSN(10), ReconfigRequestSN(3), TSN(13), {kStreamId}));
EXPECT_THAT(HandleAndCatchResponse(ReConfigChunk(builder.Build())),
ElementsAre(Property(&ReconfigurationResponseParameter::result,
ResponseResult::kInProgress)));
data_tracker_->Observe(TSN(15));
reasm_->Add(TSN(15), gen_.Ordered({1, 2, 3, 4}, "BE",
{.mid = MID(1), .ppid = PPID(5)}));
data_tracker_->Observe(TSN(14));
reasm_->Add(TSN(14), gen_.Ordered({1, 2, 3, 4}, "BE",
{.mid = MID(0), .ppid = PPID(4)}));
data_tracker_->Observe(TSN(13));
reasm_->Add(TSN(13), gen_.Ordered({1, 2, 3, 4}, "BE",
{.mid = MID(3), .ppid = PPID(3)}));
data_tracker_->Observe(TSN(12));
reasm_->Add(TSN(12), gen_.Ordered({1, 2, 3, 4}, "BE",
{.mid = MID(2), .ppid = PPID(2)}));
builder.Add(OutgoingSSNResetRequestParameter(
ReconfigRequestSN(11), ReconfigRequestSN(4), TSN(13), {kStreamId}));
EXPECT_THAT(HandleAndCatchResponse(ReConfigChunk(builder.Build())),
ElementsAre(Property(&ReconfigurationResponseParameter::result,
ResponseResult::kSuccessPerformed)));
EXPECT_THAT(
reasm_->FlushMessages(),
UnorderedElementsAre(SctpMessageIs(kStreamId, PPID(2), kShortPayload),
SctpMessageIs(kStreamId, PPID(3), kShortPayload),
SctpMessageIs(kStreamId, PPID(4), kShortPayload),
SctpMessageIs(kStreamId, PPID(5), kShortPayload)));
}
TEST_F(StreamResetHandlerTest, ResetStreamsDeferredOnlySelectedStreams) {
// This test verifies the receiving behavior of receiving messages on
// streams 1, 2 and 3, and receiving a reset request on stream 1, 2, causing
// deferred reset processing.
// Reset stream 1,2 with "last assigned TSN=12"
Parameters::Builder builder;
builder.Add(OutgoingSSNResetRequestParameter(ReconfigRequestSN(10),
ReconfigRequestSN(3), TSN(12),
{StreamID(1), StreamID(2)}));
EXPECT_THAT(HandleAndCatchResponse(ReConfigChunk(builder.Build())),
ElementsAre(Property(&ReconfigurationResponseParameter::result,
ResponseResult::kInProgress)));
// TSN 10, SID 1 - before TSN 12 -> deliver
data_tracker_->Observe(TSN(10));
reasm_->Add(TSN(10), gen_.Ordered({1, 2, 3, 4}, "BE",
{.stream_id = StreamID(1),
.mid = MID(0),
.ppid = PPID(1001)}));
// TSN 11, SID 2 - before TSN 12 -> deliver
data_tracker_->Observe(TSN(11));
reasm_->Add(TSN(11), gen_.Ordered({1, 2, 3, 4}, "BE",
{.stream_id = StreamID(2),
.mid = MID(0),
.ppid = PPID(1002)}));
// TSN 12, SID 3 - at TSN 12 -> deliver
data_tracker_->Observe(TSN(12));
reasm_->Add(TSN(12), gen_.Ordered({1, 2, 3, 4}, "BE",
{.stream_id = StreamID(3),
.mid = MID(0),
.ppid = PPID(1003)}));
// TSN 13, SID 1 - after TSN 12 and SID=1 -> defer
data_tracker_->Observe(TSN(13));
reasm_->Add(TSN(13), gen_.Ordered({1, 2, 3, 4}, "BE",
{.stream_id = StreamID(1),
.mid = MID(0),
.ppid = PPID(1004)}));
// TSN 14, SID 2 - after TSN 12 and SID=2 -> defer
data_tracker_->Observe(TSN(14));
reasm_->Add(TSN(14), gen_.Ordered({1, 2, 3, 4}, "BE",
{.stream_id = StreamID(2),
.mid = MID(0),
.ppid = PPID(1005)}));
// TSN 15, SID 3 - after TSN 12, but SID 3 is not reset -> deliver
data_tracker_->Observe(TSN(15));
reasm_->Add(TSN(15), gen_.Ordered({1, 2, 3, 4}, "BE",
{.stream_id = StreamID(3),
.mid = MID(1),
.ppid = PPID(1006)}));
EXPECT_THAT(reasm_->FlushMessages(),
UnorderedElementsAre(
SctpMessageIs(StreamID(1), PPID(1001), kShortPayload),
SctpMessageIs(StreamID(2), PPID(1002), kShortPayload),
SctpMessageIs(StreamID(3), PPID(1003), kShortPayload),
SctpMessageIs(StreamID(3), PPID(1006), kShortPayload)));
builder.Add(OutgoingSSNResetRequestParameter(ReconfigRequestSN(11),
ReconfigRequestSN(3), TSN(13),
{StreamID(1), StreamID(2)}));
EXPECT_THAT(HandleAndCatchResponse(ReConfigChunk(builder.Build())),
ElementsAre(Property(&ReconfigurationResponseParameter::result,
ResponseResult::kSuccessPerformed)));
EXPECT_THAT(reasm_->FlushMessages(),
UnorderedElementsAre(
SctpMessageIs(StreamID(1), PPID(1004), kShortPayload),
SctpMessageIs(StreamID(2), PPID(1005), kShortPayload)));
}
TEST_F(StreamResetHandlerTest, ResetStreamsDefersForwardTsn) {
// This test verifies that FORWARD-TSNs are deferred if they want to move
// the cumulative ack TSN point past sender's last assigned TSN.
static constexpr StreamID kStreamId = StreamID(42);
// Simulate sender sends:
// * TSN 10 (SSN=0, BE, lost),
// * TSN 11 (SSN=1, BE, lost),
// * TSN 12 (SSN=2, BE, lost)
// * RESET THE STREAM
// * TSN 13 (SSN=0, B, received)
// * TSN 14 (SSN=0, E, lost),
// * TSN 15 (SSN=1, BE, received)
Parameters::Builder builder;
builder.Add(OutgoingSSNResetRequestParameter(
ReconfigRequestSN(10), ReconfigRequestSN(3), TSN(12), {kStreamId}));
EXPECT_THAT(HandleAndCatchResponse(ReConfigChunk(builder.Build())),
ElementsAre(Property(&ReconfigurationResponseParameter::result,
ResponseResult::kInProgress)));
// TSN 13, B, after TSN=12 -> defer
data_tracker_->Observe(TSN(13));
reasm_->Add(TSN(13),
gen_.Ordered(
{1, 2, 3, 4}, "B",
{.stream_id = kStreamId, .mid = MID(0), .ppid = PPID(1004)}));
// TSN 15, BE, after TSN=12 -> defer
data_tracker_->Observe(TSN(15));
reasm_->Add(TSN(15),
gen_.Ordered(
{1, 2, 3, 4}, "BE",
{.stream_id = kStreamId, .mid = MID(1), .ppid = PPID(1005)}));
// Time passes, sender decides to send FORWARD-TSN up to the RESET.
data_tracker_->HandleForwardTsn(TSN(12));
reasm_->HandleForwardTsn(
TSN(12), std::vector<SkippedStream>({SkippedStream(kStreamId, SSN(2))}));
// The receiver sends a SACK in response to that. The stream hasn't been
// reset yet, but the sender now decides that TSN=13-14 is to be skipped.
// As this has a TSN 14, after TSN=12 -> defer it.
data_tracker_->HandleForwardTsn(TSN(14));
reasm_->HandleForwardTsn(
TSN(14), std::vector<SkippedStream>({SkippedStream(kStreamId, SSN(0))}));
// Reset the stream -> deferred TSNs should be re-added.
builder.Add(OutgoingSSNResetRequestParameter(
ReconfigRequestSN(11), ReconfigRequestSN(3), TSN(12), {kStreamId}));
EXPECT_THAT(HandleAndCatchResponse(ReConfigChunk(builder.Build())),
ElementsAre(Property(&ReconfigurationResponseParameter::result,
ResponseResult::kSuccessPerformed)));
EXPECT_THAT(reasm_->FlushMessages(),
UnorderedElementsAre(
SctpMessageIs(kStreamId, PPID(1005), kShortPayload)));
}
TEST_F(StreamResetHandlerTest, SendOutgoingRequestDirectly) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
absl::optional<ReConfigChunk> reconfig = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig->parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req.request_sequence_number(), kMyInitialReqSn);
EXPECT_EQ(req.sender_last_assigned_tsn(),
TSN(*retransmission_queue_->next_tsn() - 1));
EXPECT_THAT(req.stream_ids(), UnorderedElementsAre(StreamID(42)));
}
TEST_F(StreamResetHandlerTest, ResetMultipleStreamsInOneRequest) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(40)));
EXPECT_CALL(producer_, PrepareResetStream(StreamID(41)));
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42))).Times(2);
EXPECT_CALL(producer_, PrepareResetStream(StreamID(43)));
EXPECT_CALL(producer_, PrepareResetStream(StreamID(44)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
handler_->ResetStreams(
std::vector<StreamID>({StreamID(43), StreamID(44), StreamID(41)}));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42), StreamID(40)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(
std::vector<StreamID>({StreamID(40), StreamID(41), StreamID(42),
StreamID(43), StreamID(44)})));
absl::optional<ReConfigChunk> reconfig = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig->parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req.request_sequence_number(), kMyInitialReqSn);
EXPECT_EQ(req.sender_last_assigned_tsn(),
TSN(*retransmission_queue_->next_tsn() - 1));
EXPECT_THAT(req.stream_ids(),
UnorderedElementsAre(StreamID(40), StreamID(41), StreamID(42),
StreamID(43), StreamID(44)));
}
TEST_F(StreamResetHandlerTest, SendOutgoingRequestDeferred) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset())
.WillOnce(Return(false))
.WillOnce(Return(false))
.WillOnce(Return(true));
EXPECT_FALSE(handler_->MakeStreamResetRequest().has_value());
EXPECT_FALSE(handler_->MakeStreamResetRequest().has_value());
EXPECT_TRUE(handler_->MakeStreamResetRequest().has_value());
}
TEST_F(StreamResetHandlerTest, SendOutgoingResettingOnPositiveResponse) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
absl::optional<ReConfigChunk> reconfig = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig->parameters().get<OutgoingSSNResetRequestParameter>());
Parameters::Builder builder;
builder.Add(ReconfigurationResponseParameter(
req.request_sequence_number(), ResponseResult::kSuccessPerformed));
ReConfigChunk response_reconfig(builder.Build());
EXPECT_CALL(producer_, CommitResetStreams);
EXPECT_CALL(producer_, RollbackResetStreams).Times(0);
// Processing a response shouldn't result in sending anything.
EXPECT_CALL(callbacks_, OnError).Times(0);
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(0);
handler_->HandleReConfig(std::move(response_reconfig));
}
TEST_F(StreamResetHandlerTest, SendOutgoingResetRollbackOnError) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
absl::optional<ReConfigChunk> reconfig = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig->parameters().get<OutgoingSSNResetRequestParameter>());
Parameters::Builder builder;
builder.Add(ReconfigurationResponseParameter(
req.request_sequence_number(), ResponseResult::kErrorBadSequenceNumber));
ReConfigChunk response_reconfig(builder.Build());
EXPECT_CALL(producer_, CommitResetStreams).Times(0);
EXPECT_CALL(producer_, RollbackResetStreams);
// Only requests should result in sending responses.
EXPECT_CALL(callbacks_, OnError).Times(0);
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(0);
handler_->HandleReConfig(std::move(response_reconfig));
}
TEST_F(StreamResetHandlerTest, SendOutgoingResetRetransmitOnInProgress) {
static constexpr StreamID kStreamToReset = StreamID(42);
EXPECT_CALL(producer_, PrepareResetStream(kStreamToReset));
handler_->ResetStreams(std::vector<StreamID>({kStreamToReset}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({kStreamToReset})));
absl::optional<ReConfigChunk> reconfig1 = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig1.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req1,
reconfig1->parameters().get<OutgoingSSNResetRequestParameter>());
// Simulate that the peer responded "In Progress".
Parameters::Builder builder;
builder.Add(ReconfigurationResponseParameter(req1.request_sequence_number(),
ResponseResult::kInProgress));
ReConfigChunk response_reconfig(builder.Build());
EXPECT_CALL(producer_, CommitResetStreams()).Times(0);
EXPECT_CALL(producer_, RollbackResetStreams()).Times(0);
// Processing a response shouldn't result in sending anything.
EXPECT_CALL(callbacks_, OnError).Times(0);
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(0);
handler_->HandleReConfig(std::move(response_reconfig));
// Let some time pass, so that the reconfig timer expires, and retries the
// same request.
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(1);
AdvanceTime(kRto);
std::vector<uint8_t> payload = callbacks_.ConsumeSentPacket();
ASSERT_FALSE(payload.empty());
ASSERT_HAS_VALUE_AND_ASSIGN(SctpPacket packet,
SctpPacket::Parse(payload, DcSctpOptions()));
ASSERT_THAT(packet.descriptors(), SizeIs(1));
ASSERT_HAS_VALUE_AND_ASSIGN(
ReConfigChunk reconfig2,
ReConfigChunk::Parse(packet.descriptors()[0].data));
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req2,
reconfig2.parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req2.request_sequence_number(),
AddTo(req1.request_sequence_number(), 1));
EXPECT_THAT(req2.stream_ids(), UnorderedElementsAre(kStreamToReset));
}
TEST_F(StreamResetHandlerTest, ResetWhileRequestIsSentWillQueue) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
absl::optional<ReConfigChunk> reconfig1 = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig1.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req1,
reconfig1->parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req1.request_sequence_number(), kMyInitialReqSn);
EXPECT_EQ(req1.sender_last_assigned_tsn(),
AddTo(retransmission_queue_->next_tsn(), -1));
EXPECT_THAT(req1.stream_ids(), UnorderedElementsAre(StreamID(42)));
// Streams reset while the request is in-flight will be queued.
EXPECT_CALL(producer_, PrepareResetStream(StreamID(41)));
EXPECT_CALL(producer_, PrepareResetStream(StreamID(43)));
StreamID stream_ids[] = {StreamID(41), StreamID(43)};
handler_->ResetStreams(stream_ids);
EXPECT_EQ(handler_->MakeStreamResetRequest(), absl::nullopt);
Parameters::Builder builder;
builder.Add(ReconfigurationResponseParameter(
req1.request_sequence_number(), ResponseResult::kSuccessPerformed));
ReConfigChunk response_reconfig(builder.Build());
EXPECT_CALL(producer_, CommitResetStreams()).Times(1);
EXPECT_CALL(producer_, RollbackResetStreams()).Times(0);
// Processing a response shouldn't result in sending anything.
EXPECT_CALL(callbacks_, OnError).Times(0);
EXPECT_CALL(callbacks_, SendPacketWithStatus).Times(0);
handler_->HandleReConfig(std::move(response_reconfig));
// Response has been processed. A new request can be sent.
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(41), StreamID(43)})));
absl::optional<ReConfigChunk> reconfig2 = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig2.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req2,
reconfig2->parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req2.request_sequence_number(), AddTo(kMyInitialReqSn, 1));
EXPECT_EQ(req2.sender_last_assigned_tsn(),
TSN(*retransmission_queue_->next_tsn() - 1));
EXPECT_THAT(req2.stream_ids(),
UnorderedElementsAre(StreamID(41), StreamID(43)));
}
TEST_F(StreamResetHandlerTest, SendIncomingResetJustReturnsNothingPerformed) {
Parameters::Builder builder;
builder.Add(
IncomingSSNResetRequestParameter(kPeerInitialReqSn, {StreamID(1)}));
std::vector<ReconfigurationResponseParameter> responses =
HandleAndCatchResponse(ReConfigChunk(builder.Build()));
ASSERT_THAT(responses, SizeIs(1));
EXPECT_THAT(responses[0].response_sequence_number(), kPeerInitialReqSn);
EXPECT_THAT(responses[0].result(), ResponseResult::kSuccessNothingToDo);
}
TEST_F(StreamResetHandlerTest, SendSameRequestTwiceIsIdempotent) {
// Simulate that receiving the same chunk twice (due to network issues,
// or retransmissions, causing a RECONFIG to be re-received) is idempotent.
for (int i = 0; i < 2; ++i) {
Parameters::Builder builder;
builder.Add(OutgoingSSNResetRequestParameter(
kPeerInitialReqSn, ReconfigRequestSN(3), AddTo(kPeerInitialTsn, 1),
{StreamID(1)}));
std::vector<ReconfigurationResponseParameter> responses1 =
HandleAndCatchResponse(ReConfigChunk(builder.Build()));
EXPECT_THAT(responses1, SizeIs(1));
EXPECT_EQ(responses1[0].result(), ResponseResult::kInProgress);
}
}
TEST_F(StreamResetHandlerTest,
HandoverIsAllowedOnlyWhenNoStreamIsBeingOrWillBeReset) {
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_EQ(
handler_->GetHandoverReadiness(),
HandoverReadinessStatus(HandoverUnreadinessReason::kPendingStreamReset));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset())
.WillOnce(Return(true))
.WillOnce(Return(false));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
ASSERT_TRUE(handler_->MakeStreamResetRequest().has_value());
EXPECT_EQ(handler_->GetHandoverReadiness(),
HandoverReadinessStatus(
HandoverUnreadinessReason::kPendingStreamResetRequest));
// Reset more streams while the request is in-flight.
EXPECT_CALL(producer_, PrepareResetStream(StreamID(41)));
EXPECT_CALL(producer_, PrepareResetStream(StreamID(43)));
StreamID stream_ids[] = {StreamID(41), StreamID(43)};
handler_->ResetStreams(stream_ids);
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_EQ(handler_->GetHandoverReadiness(),
HandoverReadinessStatus()
.Add(HandoverUnreadinessReason::kPendingStreamResetRequest)
.Add(HandoverUnreadinessReason::kPendingStreamReset));
// Processing a response to first request.
EXPECT_CALL(producer_, CommitResetStreams()).Times(1);
handler_->HandleReConfig(
ReConfigChunk(Parameters::Builder()
.Add(ReconfigurationResponseParameter(
kMyInitialReqSn, ResponseResult::kSuccessPerformed))
.Build()));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_EQ(
handler_->GetHandoverReadiness(),
HandoverReadinessStatus(HandoverUnreadinessReason::kPendingStreamReset));
// Second request can be sent.
EXPECT_CALL(producer_, HasStreamsReadyToBeReset())
.WillOnce(Return(true))
.WillOnce(Return(false));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(41), StreamID(43)})));
ASSERT_TRUE(handler_->MakeStreamResetRequest().has_value());
EXPECT_EQ(handler_->GetHandoverReadiness(),
HandoverReadinessStatus(
HandoverUnreadinessReason::kPendingStreamResetRequest));
// Processing a response to second request.
EXPECT_CALL(producer_, CommitResetStreams()).Times(1);
handler_->HandleReConfig(ReConfigChunk(
Parameters::Builder()
.Add(ReconfigurationResponseParameter(
AddTo(kMyInitialReqSn, 1), ResponseResult::kSuccessPerformed))
.Build()));
// Seconds response has been processed. No pending resets.
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(false));
EXPECT_TRUE(handler_->GetHandoverReadiness().IsReady());
}
TEST_F(StreamResetHandlerTest, HandoverInInitialState) {
PerformHandover();
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
absl::optional<ReConfigChunk> reconfig = handler_->MakeStreamResetRequest();
ASSERT_TRUE(reconfig.has_value());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig->parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req.request_sequence_number(), kMyInitialReqSn);
EXPECT_EQ(req.sender_last_assigned_tsn(),
TSN(*retransmission_queue_->next_tsn() - 1));
EXPECT_THAT(req.stream_ids(), UnorderedElementsAre(StreamID(42)));
}
TEST_F(StreamResetHandlerTest, HandoverAfterHavingResetOneStream) {
// Reset one stream
{
EXPECT_CALL(producer_, PrepareResetStream(StreamID(42)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(42)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset())
.WillOnce(Return(true))
.WillOnce(Return(false));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(42)})));
ASSERT_HAS_VALUE_AND_ASSIGN(ReConfigChunk reconfig,
handler_->MakeStreamResetRequest());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig.parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req.request_sequence_number(), kMyInitialReqSn);
EXPECT_EQ(req.sender_last_assigned_tsn(),
TSN(*retransmission_queue_->next_tsn() - 1));
EXPECT_THAT(req.stream_ids(), UnorderedElementsAre(StreamID(42)));
EXPECT_CALL(producer_, CommitResetStreams()).Times(1);
handler_->HandleReConfig(
ReConfigChunk(Parameters::Builder()
.Add(ReconfigurationResponseParameter(
req.request_sequence_number(),
ResponseResult::kSuccessPerformed))
.Build()));
}
PerformHandover();
// Reset another stream after handover
{
EXPECT_CALL(producer_, PrepareResetStream(StreamID(43)));
handler_->ResetStreams(std::vector<StreamID>({StreamID(43)}));
EXPECT_CALL(producer_, HasStreamsReadyToBeReset()).WillOnce(Return(true));
EXPECT_CALL(producer_, GetStreamsReadyToBeReset())
.WillOnce(Return(std::vector<StreamID>({StreamID(43)})));
ASSERT_HAS_VALUE_AND_ASSIGN(ReConfigChunk reconfig,
handler_->MakeStreamResetRequest());
ASSERT_HAS_VALUE_AND_ASSIGN(
OutgoingSSNResetRequestParameter req,
reconfig.parameters().get<OutgoingSSNResetRequestParameter>());
EXPECT_EQ(req.request_sequence_number(),
ReconfigRequestSN(kMyInitialReqSn.value() + 1));
EXPECT_EQ(req.sender_last_assigned_tsn(),
TSN(*retransmission_queue_->next_tsn() - 1));
EXPECT_THAT(req.stream_ids(), UnorderedElementsAre(StreamID(43)));
}
}
TEST_F(StreamResetHandlerTest, PerformCloseAfterOneFirstFailing) {
// Inject a stream reset on the first expected TSN (which hasn't been seen).
Parameters::Builder builder;
builder.Add(OutgoingSSNResetRequestParameter(
kPeerInitialReqSn, ReconfigRequestSN(3), kPeerInitialTsn, {StreamID(1)}));
// The socket is expected to say "in progress" as that TSN hasn't been seen.
std::vector<ReconfigurationResponseParameter> responses =
HandleAndCatchResponse(ReConfigChunk(builder.Build()));
EXPECT_THAT(responses, SizeIs(1));
EXPECT_EQ(responses[0].result(), ResponseResult::kInProgress);
// Let the socket receive the TSN.
DataGeneratorOptions opts;
opts.mid = MID(0);
reasm_->Add(kPeerInitialTsn, gen_.Ordered({1, 2, 3, 4}, "BE", opts));
data_tracker_->Observe(kPeerInitialTsn);
// And emulate that time has passed, and the peer retries the stream reset,
// but now with an incremented request sequence number.
Parameters::Builder builder2;
builder2.Add(OutgoingSSNResetRequestParameter(
ReconfigRequestSN(*kPeerInitialReqSn + 1), ReconfigRequestSN(3),
kPeerInitialTsn, {StreamID(1)}));
// This is supposed to be handled well.
std::vector<ReconfigurationResponseParameter> responses2 =
HandleAndCatchResponse(ReConfigChunk(builder2.Build()));
EXPECT_THAT(responses2, SizeIs(1));
EXPECT_EQ(responses2[0].result(), ResponseResult::kSuccessPerformed);
}
} // namespace
} // namespace dcsctp