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3a45d32d4e
Reporting the duplicate TSNs is a SHOULD in the RFC, and using the duplicate TNSs is a MAY, and in reality I haven't seen an implementation use it yet. However, it's good for debugging and for stats generation. Bug: webrtc:12614 Change-Id: I1cc3f86961a8d289708cbf50d98dedfd25077955 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219462 Reviewed-by: Florent Castelli <orphis@webrtc.org> Commit-Queue: Victor Boivie <boivie@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34053}
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef NET_DCSCTP_PACKET_CHUNK_SACK_CHUNK_H_
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#define NET_DCSCTP_PACKET_CHUNK_SACK_CHUNK_H_
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#include <stddef.h>
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#include <cstdint>
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#include <set>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/strings/string_view.h"
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#include "api/array_view.h"
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#include "net/dcsctp/packet/chunk/chunk.h"
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#include "net/dcsctp/packet/tlv_trait.h"
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namespace dcsctp {
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// https://tools.ietf.org/html/rfc4960#section-3.3.4
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struct SackChunkConfig : ChunkConfig {
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static constexpr int kType = 3;
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static constexpr size_t kHeaderSize = 16;
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static constexpr size_t kVariableLengthAlignment = 4;
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};
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class SackChunk : public Chunk, public TLVTrait<SackChunkConfig> {
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public:
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static constexpr int kType = SackChunkConfig::kType;
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struct GapAckBlock {
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GapAckBlock(uint16_t start, uint16_t end) : start(start), end(end) {}
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uint16_t start;
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uint16_t end;
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bool operator==(const GapAckBlock& other) const {
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return start == other.start && end == other.end;
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}
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};
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SackChunk(TSN cumulative_tsn_ack,
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uint32_t a_rwnd,
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std::vector<GapAckBlock> gap_ack_blocks,
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std::set<TSN> duplicate_tsns)
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: cumulative_tsn_ack_(cumulative_tsn_ack),
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a_rwnd_(a_rwnd),
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gap_ack_blocks_(std::move(gap_ack_blocks)),
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duplicate_tsns_(std::move(duplicate_tsns)) {}
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static absl::optional<SackChunk> Parse(rtc::ArrayView<const uint8_t> data);
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void SerializeTo(std::vector<uint8_t>& out) const override;
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std::string ToString() const override;
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TSN cumulative_tsn_ack() const { return cumulative_tsn_ack_; }
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uint32_t a_rwnd() const { return a_rwnd_; }
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rtc::ArrayView<const GapAckBlock> gap_ack_blocks() const {
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return gap_ack_blocks_;
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}
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const std::set<TSN>& duplicate_tsns() const { return duplicate_tsns_; }
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private:
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static constexpr size_t kGapAckBlockSize = 4;
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static constexpr size_t kDupTsnBlockSize = 4;
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const TSN cumulative_tsn_ack_;
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const uint32_t a_rwnd_;
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std::vector<GapAckBlock> gap_ack_blocks_;
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std::set<TSN> duplicate_tsns_;
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};
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} // namespace dcsctp
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#endif // NET_DCSCTP_PACKET_CHUNK_SACK_CHUNK_H_
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