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Diffstat (limited to 'third_party/libwebrtc/net/dcsctp/packet/chunk/init_ack_chunk.cc')
-rw-r--r-- | third_party/libwebrtc/net/dcsctp/packet/chunk/init_ack_chunk.cc | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/chunk/init_ack_chunk.cc b/third_party/libwebrtc/net/dcsctp/packet/chunk/init_ack_chunk.cc new file mode 100644 index 0000000000..c7ef9da1f1 --- /dev/null +++ b/third_party/libwebrtc/net/dcsctp/packet/chunk/init_ack_chunk.cc @@ -0,0 +1,86 @@ +/* + * 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/chunk/init_ack_chunk.h" + +#include <stdint.h> + +#include <string> +#include <utility> +#include <vector> + +#include "absl/types/optional.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/parameter/parameter.h" +#include "net/dcsctp/packet/tlv_trait.h" +#include "rtc_base/strings/string_format.h" + +namespace dcsctp { + +// https://tools.ietf.org/html/rfc4960#section-3.3.3 + +// 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 +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Type = 2 | Chunk Flags | Chunk Length | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Initiate Tag | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Advertised Receiver Window Credit | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Number of Outbound Streams | Number of Inbound Streams | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// | Initial TSN | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// \ \ +// / Optional/Variable-Length Parameters / +// \ \ +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +constexpr int InitAckChunk::kType; + +absl::optional<InitAckChunk> InitAckChunk::Parse( + rtc::ArrayView<const uint8_t> data) { + absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); + if (!reader.has_value()) { + return absl::nullopt; + } + + VerificationTag initiate_tag(reader->Load32<4>()); + uint32_t a_rwnd = reader->Load32<8>(); + uint16_t nbr_outbound_streams = reader->Load16<12>(); + uint16_t nbr_inbound_streams = reader->Load16<14>(); + TSN initial_tsn(reader->Load32<16>()); + absl::optional<Parameters> parameters = + Parameters::Parse(reader->variable_data()); + if (!parameters.has_value()) { + return absl::nullopt; + } + return InitAckChunk(initiate_tag, a_rwnd, nbr_outbound_streams, + nbr_inbound_streams, initial_tsn, *std::move(parameters)); +} + +void InitAckChunk::SerializeTo(std::vector<uint8_t>& out) const { + rtc::ArrayView<const uint8_t> parameters = parameters_.data(); + BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, parameters.size()); + + writer.Store32<4>(*initiate_tag_); + writer.Store32<8>(a_rwnd_); + writer.Store16<12>(nbr_outbound_streams_); + writer.Store16<14>(nbr_inbound_streams_); + writer.Store32<16>(*initial_tsn_); + writer.CopyToVariableData(parameters); +} + +std::string InitAckChunk::ToString() const { + return rtc::StringFormat("INIT_ACK, initiate_tag=0x%0x, initial_tsn=%u", + *initiate_tag(), *initial_tsn()); +} +} // namespace dcsctp |