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Fix panic in IPv6 multicast code
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Authored by ae on Aug 5 2021, 8:59 AM.
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Details

Summary
Add check that ifp supports IPv6 multicasts in in6_getmulti.

This fixes panic when user application tries to join into multicast
group on an interface that doesn't support IPv6 multicasts, like
IFT_PFLOG interfaces.

PR:             257302

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Repository
rG FreeBSD src repository
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