Relanding: Fix data channel message integrity violation

Patch originally submitted by Lennart Grahl:
https://webrtc-review.googlesource.com/c/src/+/177527

SCTP message chunks and notifications are being delivered interleaved.
However, the way the code was structured previously, a notification
would interrupt reassembly of a message chunk and hand out the partial
message, thereby violating message integrity. This patch separates the
handling of notifications and reassembly of messages.

Additional changes:

- Remove illegal cast from non-validated u32 to enum (PPID)
- Drop partial messages if the SID has been changed but EOR not yet
  received instead of delivering them. (This should never happen
  anyway.)
- Don't treat TSN as timestamp (wat)
- Replace "usrsctplib/usrsctp.h" with <usrsctp.h>, allowing a hack
  to be removed from media/BUILD.gn

Bug: webrtc:11708
Change-Id: I29733b03f67a3d840104b8608a7f0083466c2d0f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178469
Commit-Queue: Taylor <deadbeef@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31641}
5 files changed
tree: 43b2297b812276f4ee18572684a7a584dd9ebaef
  1. api/
  2. audio/
  3. build_overrides/
  4. call/
  5. common_audio/
  6. common_video/
  7. data/
  8. docs/
  9. examples/
  10. logging/
  11. media/
  12. modules/
  13. p2p/
  14. pc/
  15. resources/
  16. rtc_base/
  17. rtc_tools/
  18. sdk/
  19. stats/
  20. style-guide/
  21. system_wrappers/
  22. test/
  23. tools_webrtc/
  24. video/
  25. .clang-format
  26. .git-blame-ignore-revs
  27. .gitignore
  28. .gn
  29. .vpython
  30. abseil-in-webrtc.md
  31. AUTHORS
  32. BUILD.gn
  33. CODE_OF_CONDUCT.md
  34. codereview.settings
  35. common_types.h
  36. DEPS
  37. ENG_REVIEW_OWNERS
  38. LICENSE
  39. license_template.txt
  40. native-api.md
  41. OWNERS
  42. PATENTS
  43. PRESUBMIT.py
  44. presubmit_test.py
  45. presubmit_test_mocks.py
  46. pylintrc
  47. README.chromium
  48. README.md
  49. style-guide.md
  50. WATCHLISTS
  51. webrtc.gni
  52. webrtc_lib_link_test.cc
  53. whitespace.txt
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

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The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.

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See here for instructions on how to get started developing with the native code.

Authoritative list of directories that contain the native API header files.

More info