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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/packet/parameter/reconfiguration_response_parameter.h"
#include <stddef.h>
#include <stdint.h>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "net/dcsctp/packet/bounded_byte_reader.h"
#include "net/dcsctp/packet/bounded_byte_writer.h"
#include "net/dcsctp/packet/tlv_trait.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
namespace dcsctp {
// https://tools.ietf.org/html/rfc6525#section-4.4
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Parameter Type = 16 | Parameter Length |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Re-configuration Response Sequence Number |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Result |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Sender's Next TSN (optional) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Receiver's Next TSN (optional) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
constexpr int ReconfigurationResponseParameter::kType;
absl::string_view ToString(ReconfigurationResponseParameter::Result result) {
switch (result) {
case ReconfigurationResponseParameter::Result::kSuccessNothingToDo:
return "Success: nothing to do";
case ReconfigurationResponseParameter::Result::kSuccessPerformed:
return "Success: performed";
case ReconfigurationResponseParameter::Result::kDenied:
return "Denied";
case ReconfigurationResponseParameter::Result::kErrorWrongSSN:
return "Error: wrong ssn";
case ReconfigurationResponseParameter::Result::
kErrorRequestAlreadyInProgress:
return "Error: request already in progress";
case ReconfigurationResponseParameter::Result::kErrorBadSequenceNumber:
return "Error: bad sequence number";
case ReconfigurationResponseParameter::Result::kInProgress:
return "In progress";
}
}
std::optional<ReconfigurationResponseParameter>
ReconfigurationResponseParameter::Parse(webrtc::ArrayView<const uint8_t> data) {
std::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
if (!reader.has_value()) {
return std::nullopt;
}
ReconfigRequestSN response_sequence_number(reader->Load32<4>());
Result result;
uint32_t result_nbr = reader->Load32<8>();
switch (result_nbr) {
case 0:
result = ReconfigurationResponseParameter::Result::kSuccessNothingToDo;
break;
case 1:
result = ReconfigurationResponseParameter::Result::kSuccessPerformed;
break;
case 2:
result = ReconfigurationResponseParameter::Result::kDenied;
break;
case 3:
result = ReconfigurationResponseParameter::Result::kErrorWrongSSN;
break;
case 4:
result = ReconfigurationResponseParameter::Result::
kErrorRequestAlreadyInProgress;
break;
case 5:
result =
ReconfigurationResponseParameter::Result::kErrorBadSequenceNumber;
break;
case 6:
result = ReconfigurationResponseParameter::Result::kInProgress;
break;
default:
RTC_DLOG(LS_WARNING) << "Invalid reconfig response result: "
<< result_nbr;
return std::nullopt;
}
if (reader->variable_data().empty()) {
return ReconfigurationResponseParameter(response_sequence_number, result);
} else if (reader->variable_data_size() != kNextTsnHeaderSize) {
RTC_DLOG(LS_WARNING) << "Invalid parameter size";
return std::nullopt;
}
BoundedByteReader<kNextTsnHeaderSize> sub_reader =
reader->sub_reader<kNextTsnHeaderSize>(0);
TSN sender_next_tsn(sub_reader.Load32<0>());
TSN receiver_next_tsn(sub_reader.Load32<4>());
return ReconfigurationResponseParameter(response_sequence_number, result,
sender_next_tsn, receiver_next_tsn);
}
void ReconfigurationResponseParameter::SerializeTo(
std::vector<uint8_t>& out) const {
size_t variable_size =
(sender_next_tsn().has_value() ? kNextTsnHeaderSize : 0);
BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, variable_size);
writer.Store32<4>(*response_sequence_number_);
uint32_t result_nbr =
static_cast<std::underlying_type<Result>::type>(result_);
writer.Store32<8>(result_nbr);
if (sender_next_tsn().has_value()) {
BoundedByteWriter<kNextTsnHeaderSize> sub_writer =
writer.sub_writer<kNextTsnHeaderSize>(0);
sub_writer.Store32<0>(sender_next_tsn_.has_value() ? **sender_next_tsn_
: 0);
sub_writer.Store32<4>(receiver_next_tsn_.has_value() ? **receiver_next_tsn_
: 0);
}
}
std::string ReconfigurationResponseParameter::ToString() const {
webrtc::StringBuilder sb;
sb << "Re-configuration Response, resp_seq_nbr="
<< *response_sequence_number();
return sb.Release();
}
} // namespace dcsctp
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