<h3>Contribution description</h3>
<p>This PR is another spin-off from <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="840093485" data-permission-text="Title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/16228" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/16228/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/16228">#16228</a>. Its changes let the the <code>aac_mode</code> field of <code>gnrc_netif_ipv6_t</code> be treated as flag field.<br>
The members of the <code>net_gnrc_netif_aac</code> enum are updated accordingly. This way, it is possible for a net interface to use (for instance) both SLAAC and DHCPv6 for auto-adress configuration.</p>
<h3>Testing procedure</h3>
<p>As this is curently more or less a refactoring, you can use the existing <code>gnrc</code> and unit tests should which should still be passing.</p>
<h3>Issues/PRs references</h3>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/16596'>https://github.com/RIOT-OS/RIOT/pull/16596</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>sys/net/gnrc/netif: Make aac_mode a flag field</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16596/files#diff-133c8524e64b2e19f66a2accb5fa9e590eb39d0099d002dd11311a399780e7e0">sys/include/net/gnrc/netif/flags.h</a>
    (10)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16596/files#diff-5fea0d438d63f1616b6be095b6849b41927df8f87fe2d1abddf298fc6057b2b6">sys/include/net/gnrc/netif/ipv6.h</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16596/files#diff-ec477c25cc3f388469264ac80fa314b1449c8d18b30d9b0dd8baeff2d8a73e70">sys/net/gnrc/network_layer/ipv6/nib/_nib-slaac.c</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16596/files#diff-fba26fd610698922256809a70531c3b18dc624a771563ea8887a08bbf762c457">sys/net/gnrc/network_layer/ipv6/nib/nib.c</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16596/files#diff-e950ca480bdabe90d7d0af737f392c012bb199020886205d253de740aa960b63">sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16596/files#diff-d4f3105cafdb81be6e131a7cae2ed83f1dc7318eb23a145fba6bc812062c8249">sys/net/gnrc/network_layer/ndp/gnrc_ndp.c</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16596.patch'>https://github.com/RIOT-OS/RIOT/pull/16596.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16596.diff'>https://github.com/RIOT-OS/RIOT/pull/16596.diff</a></li>
</ul>

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