socket: Move SO_SETFIB handling to protocol layers

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.

Reviewed by:	glebius
MFC after:	2 weeks
Sponsored by:	Klara, Inc.
Sponsored by:	Stormshield
Differential Revision:	https://reviews.freebsd.org/D48666

0 files changed, 0 insertions, 0 deletions