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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}
65 lines
2.1 KiB
C++
65 lines
2.1 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_SOCKET_STATE_COOKIE_H_
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#define 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/common/internal_types.h"
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#include "net/dcsctp/socket/capabilities.h"
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namespace dcsctp {
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// This is serialized as a state cookie and put in INIT_ACK. The client then
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// responds with this in COOKIE_ECHO.
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//
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// NOTE: Expect that the client will modify it to try to exploit the library.
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// Do not trust anything in it; no pointers or anything like that.
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class StateCookie {
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public:
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static constexpr size_t kCookieSize = 36;
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StateCookie(VerificationTag initiate_tag,
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TSN initial_tsn,
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uint32_t a_rwnd,
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TieTag tie_tag,
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Capabilities capabilities)
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: initiate_tag_(initiate_tag),
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initial_tsn_(initial_tsn),
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a_rwnd_(a_rwnd),
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tie_tag_(tie_tag),
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capabilities_(capabilities) {}
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// Returns a serialized version of this cookie.
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std::vector<uint8_t> Serialize();
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// Deserializes the cookie, and returns absl::nullopt if that failed.
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static absl::optional<StateCookie> Deserialize(
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rtc::ArrayView<const uint8_t> cookie);
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VerificationTag initiate_tag() const { return initiate_tag_; }
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TSN initial_tsn() const { return initial_tsn_; }
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uint32_t a_rwnd() const { return a_rwnd_; }
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TieTag tie_tag() const { return tie_tag_; }
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const Capabilities& capabilities() const { return capabilities_; }
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private:
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const VerificationTag initiate_tag_;
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const TSN initial_tsn_;
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const uint32_t a_rwnd_;
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const TieTag tie_tag_;
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const Capabilities capabilities_;
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};
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} // namespace dcsctp
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#endif // NET_DCSCTP_SOCKET_STATE_COOKIE_H_
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