[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_nib: provide functions to get offset of public timestamps (#16706)

Martine Lenders notifications at github.com
Wed Aug 4 12:43:58 CEST 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description
`gnrc_ipv6_nib` provides for some of its view a time stamp until which an entry is valid. Since we now have multiple clocks that provide timestamps, getting the offset of the current time to said timestamp can be tricky, since it is not immediately clear what the timestamp was generated from. This aims to solve that by providing helper functions to the affected NIB views to calculate that offset for external use.
Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
- you can also give more information to reviewers about how to test your changes

### Testing procedure
Did not bother to provide tests. The functions are simple enough so just read ;-).
Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
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### Issues/PRs references
Might be needed for #16536.
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * gnrc_ipv6_nib: provide functions to get offset of public timestamps

-- File Changes --

    M sys/include/net/gnrc/ipv6/nib/abr.h (15)
    M sys/include/net/gnrc/ipv6/nib/pl.h (35)

-- Patch Links --


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