tree 380b825c58d80e7a06d292358c82c90bdacc0483
parent c0484204387fd7a82e8f72dd70fcb11f7d5cc606
author Joshua Liebow-Feeser <joshlf@google.com> 1550191229 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1550269603 +0000

[recovery-netstack] ip: Improve extension traits, make them public

- Add IpPacketBuilder trait, implemented by Ipv{4,6}PacketBuilder
- Use IpPacketBuilder in IP module, simplifying sending logic
- Add more documentation to IP extension traits
- Make IP extension traits public so they can be used by other
  modules

Test: Existing tests pass; future CLs make use of this functionality,
      and are tested
Change-Id: I6bd3f68c09795b1c0a89e24ed1b218939ef7ff9c