[routing-manager] new mechanism for deprecating old on-link prefixes (#8315)

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This commit updates how `OnLinkPrefixManager` retains and deprecates
old local on-link prefixes. Instead of remembering a single old
prefix, a list of old prefixes are remembered and the number of
entries in the list can be configured at build-time using an OT
config.

If the BR is stopped, the deprecating prefixes are still remembered
and the the expire timer keeps running. They are removed from the
list when they expire. If the BR is started again the deprecating old
prefixes are again included as PIO in the emitted RA and also
published in Network Data.

The changes in this commit also ensure we can correctly handle the
situation where the extended PAN ID is changed to a previous value
before the corresponding on-link prefix expires, i.e. when a
currently deprecating prefix becomes the current local on-link prefix
again.

This commit also updates the unit test case validating the behavior of
newly added mechanism under different situations.

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This commit is contained in:

Abtin Keshavarzian

2022-10-21 21:27:57 -07:00

committed by GitHub

parent ed43da9110

commit d1653a8edc

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