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e0b45c268e
To allow the transport to be able to know which ranges of stream identifiers it can use, the negotiated incoming/inbound and outgoing/outbound stream counts will be exposed. They are added to Metrics, and guaranteed to be available from within the OnConnected callback. In this CL, dcSCTP will not validate that the client is sending on a stream that is within the negotiated bounds. That will be done as a follow-up CL. Bug: webrtc:14277 Change-Id: Ic764e5f93f53d55633ee547df86246022f4097cf Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272321 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Victor Boivie <boivie@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37876}
82 lines
3 KiB
C++
82 lines
3 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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buffer.Store16<32>(capabilities_.negotiated_maximum_incoming_streams);
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buffer.Store16<34>(capabilities_.negotiated_maximum_outgoing_streams);
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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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capabilities.negotiated_maximum_incoming_streams = buffer.Load16<32>();
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capabilities.negotiated_maximum_outgoing_streams = buffer.Load16<34>();
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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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