[Bug 250453] jexe does not set the fib of a jail

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250453

            Bug ID: 250453
           Summary: jexe does not set the fib of a jail
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dinoex at FreeBSD.org

FreeBSD 12.1-RELEASE-p8 r364057 GENERIC amd64

Booted with fibs enabled:

/boot/loader.conf:
net.fibs="8"

Starting a jail with "exec.fib"
Networking inside is working as configured.

# jail -e '~' | tr '~' '\n'
name=adsl
exec.start="/usr/sbin/sshd -f /etc/ssh/sshd_config.adsl"
exec.stop=""
exec.clean
mount.nodevfs
exec.consolelog=/dev/console
path=/jail/adsl
host.hostname=t7a.adsl.example.com
ip4.addr=192.168.8.217
interface=vlan3
exec.fib=3
allow.raw_sockets
persist

Networking is working when logging in via SSH.

# ssh root at 192.168.8.217
# netstat -nr4 | head -1
Routing tables (fib: 3)

Networking fails if commands are executed with "jexec".

# jexec adsl
# netstat -nr4 | head -1
Routing tables

Networking works if "jexec" is prefixed with the fib used.

# setfib 3 jexec adsl
# netstat -nr4 | head -1
Routing tables (fib: 3)

I would expect that attaching to a running jail, the fib of the jail is used.

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