Implement a fixed-width ring buffer for DTLS 1.3

DTLS 1.3 ACK management requires that we track:

- Received record numbers, to send in ACKs

- Information about unacked outgoing records, so we can update message
  state when ACKs from in

Both of those lists can, in principle, grow unboundedly, but can also be
freely dropped. This class is intended as a fixed-width ring buffer for
managing this. I was worried I'd need need to dip into the scary
uninitialized functions again but actually this is just an InplaceVector
and an integer, so that was quite satisfying.

Bug: 374890768
Change-Id: I4037ef5875a2df70f0dc16df1bbba478362cecce
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/72274
Reviewed-by: Nick Harper <nharper@chromium.org>
Commit-Queue: David Benjamin <davidben@google.com>
2 files changed
tree: 06f2a5afc16d0cddfcc05d54d002c1e60ee6ca1d
  1. .bcr/
  2. .github/
  3. cmake/
  4. crypto/
  5. decrepit/
  6. docs/
  7. fuzz/
  8. gen/
  9. include/
  10. infra/
  11. pki/
  12. rust/
  13. ssl/
  14. third_party/
  15. tool/
  16. util/
  17. .bazelignore
  18. .bazelrc
  19. .clang-format
  20. .gitignore
  21. API-CONVENTIONS.md
  22. BREAKING-CHANGES.md
  23. BUILD.bazel
  24. build.json
  25. BUILDING.md
  26. CMakeLists.txt
  27. codereview.settings
  28. CONTRIBUTING.md
  29. FUZZING.md
  30. go.mod
  31. go.sum
  32. INCORPORATING.md
  33. LICENSE
  34. MODULE.bazel
  35. MODULE.bazel.lock
  36. PORTING.md
  37. PrivacyInfo.xcprivacy
  38. README.md
  39. SANDBOXING.md
  40. STYLE.md
README.md

BoringSSL

BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.

Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.

Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.

BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.

Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.

Project links:

To file a security issue, use the Chromium process and mention in the report this is for BoringSSL. You can ignore the parts of the process that are specific to Chromium/Chrome.

There are other files in this directory which might be helpful: