[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


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### 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.
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### Testing procedure
Did not bother to provide tests. The functions are simple enough so just read ;-).
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### Issues/PRs references
Might be needed for #16536.
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/16706

-- 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 --

https://github.com/RIOT-OS/RIOT/pull/16706.patch
https://github.com/RIOT-OS/RIOT/pull/16706.diff

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