Introduce the net.inet.tcp.bind_all_fibs tunable, set to 1 by default
for compatibility with current behaviour. When set to 0, all TCP
listening sockets are private to their FIB. Inbound connection requests
will only succeed if a matching inpcb is bound to the same FIB as the
request.
No functional change intended, as the new behaviour is not enabled by
default.
Sponsored by: Klara, Inc.
Sponsored by: Stormshield