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socket: Move SO_SETFIB handling to protocol layers
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Authored by markj on Feb 4 2025, 5:11 PM.
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network
Summary

In particular, we store a FIB number in both struct socket and in struct
inpcb. When updating the FIB number with setsockopt(SO_SETFIB), make
the update atomic. This is required to support the new bind_all_fibs
mode, since in that mode changing the FIB of a bound socket is not
permitted.

This requires a bit more code, but avoids a layering violation in
sosetopt(), where we hard-code the list of protocol families that
implement SO_SETFIB.

Sponsored by: Klara, Inc.
Sponsored by: Stormshield

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rG FreeBSD src repository
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Buildable 62242
Build 59126: arc lint + arc unit