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b6580ccb29
This completes the basic implementation of the dcSCTP library. There are a few remaining commits to e.g. add compatibility tests and benchmarks, as well as more support for e.g. RFC8260, but those are not strictly vital for evaluation of the library. The Socket contains the connection establishment and teardown sequences as well as the general chunk dispatcher. Bug: webrtc:12614 Change-Id: I313b6c8f4accc144e3bb88ddba22269ebb8eb3cd Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214342 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33890}
78 lines
2.7 KiB
C++
78 lines
2.7 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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#include "net/dcsctp/socket/state_cookie.h"
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#include <cstdint>
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#include <vector>
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#include "absl/types/optional.h"
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#include "api/array_view.h"
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#include "net/dcsctp/packet/bounded_byte_reader.h"
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#include "net/dcsctp/packet/bounded_byte_writer.h"
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#include "net/dcsctp/socket/capabilities.h"
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#include "rtc_base/logging.h"
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namespace dcsctp {
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// Magic values, which the state cookie is prefixed with.
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constexpr uint32_t kMagic1 = 1684230979;
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constexpr uint32_t kMagic2 = 1414541360;
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constexpr size_t StateCookie::kCookieSize;
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std::vector<uint8_t> StateCookie::Serialize() {
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std::vector<uint8_t> cookie;
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cookie.resize(kCookieSize);
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BoundedByteWriter<kCookieSize> buffer(cookie);
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buffer.Store32<0>(kMagic1);
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buffer.Store32<4>(kMagic2);
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buffer.Store32<8>(*initiate_tag_);
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buffer.Store32<12>(*initial_tsn_);
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buffer.Store32<16>(a_rwnd_);
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buffer.Store32<20>(static_cast<uint32_t>(*tie_tag_ >> 32));
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buffer.Store32<24>(static_cast<uint32_t>(*tie_tag_));
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buffer.Store8<28>(capabilities_.partial_reliability);
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buffer.Store8<29>(capabilities_.message_interleaving);
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buffer.Store8<30>(capabilities_.reconfig);
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return cookie;
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}
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absl::optional<StateCookie> StateCookie::Deserialize(
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rtc::ArrayView<const uint8_t> cookie) {
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if (cookie.size() != kCookieSize) {
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RTC_DLOG(LS_WARNING) << "Invalid state cookie: " << cookie.size()
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<< " bytes";
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return absl::nullopt;
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}
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BoundedByteReader<kCookieSize> buffer(cookie);
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uint32_t magic1 = buffer.Load32<0>();
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uint32_t magic2 = buffer.Load32<4>();
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if (magic1 != kMagic1 || magic2 != kMagic2) {
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RTC_DLOG(LS_WARNING) << "Invalid state cookie; wrong magic";
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return absl::nullopt;
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}
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VerificationTag verification_tag(buffer.Load32<8>());
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TSN initial_tsn(buffer.Load32<12>());
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uint32_t a_rwnd = buffer.Load32<16>();
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uint32_t tie_tag_upper = buffer.Load32<20>();
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uint32_t tie_tag_lower = buffer.Load32<24>();
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TieTag tie_tag(static_cast<uint64_t>(tie_tag_upper) << 32 |
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static_cast<uint64_t>(tie_tag_lower));
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Capabilities capabilities;
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capabilities.partial_reliability = buffer.Load8<28>() != 0;
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capabilities.message_interleaving = buffer.Load8<29>() != 0;
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capabilities.reconfig = buffer.Load8<30>() != 0;
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return StateCookie(verification_tag, initial_tsn, a_rwnd, tie_tag,
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capabilities);
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}
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} // namespace dcsctp
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