[netstack3] Rework multicast route witness types

Rework the witness types of source addresses for multicast routes. The
source addresses must be unicast, but `UnicastAddr<Ipv4Addr>` is not a
safely constructable type (because unicastness of an IPv4 address can
only be determined in the context of a subnet).

For IPv4, rather than using `UnicastAddr`, use a custom witness type
that ensures "specified and not multicast".

Bug: 353329136
Change-Id: I93f655a3ea9d1704e6616beb9a52de48e9d31dd8
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1089036
Reviewed-by: Peter Johnston <peterjohnston@google.com>
Commit-Queue: Jeff Martin <martinjeffrey@google.com>
5 files changed
tree: 5c0b948777e81e22385b07f13a2d1300f6849b27
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. infra/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gitmodules
  21. .gn
  22. .ignore
  23. analysis_options.yaml
  24. AUTHORS
  25. BUILD.gn
  26. CODE_OF_CONDUCT.md
  27. CONTRIBUTING.md
  28. fuchsia.code-workspace
  29. LICENSE
  30. OWNERS
  31. PATENTS
  32. pyproject.toml
  33. pyrightconfig.json
  34. README.md
  35. rustfmt.toml
  36. shac.star
  37. shac.textproto
README.md

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