Make the test program run in background after doing BIOCPROMISC

t_vlan has rarely failed by checking IFF_PROMISC before the
test program do BIOCPROMISC. To solve this, BIOCPROMISC is
done in the for

Make the test program run in background after doing BIOCPROMISC

t_vlan has rarely failed by checking IFF_PROMISC before the
test program do BIOCPROMISC. To solve this, BIOCPROMISC is
done in the foreground.

fixes PR/56357

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vlan: Added missing $HIJACKING before brconfig

Added tests for adding vlan(4) to a bridge and deleting from it

- add vlan(4) that has no parent interface to a bridge member
- the vlan(4) cannot be added to a bridge member
- detach the parent

Added tests for adding vlan(4) to a bridge and deleting from it

- add vlan(4) that has no parent interface to a bridge member
- the vlan(4) cannot be added to a bridge member
- detach the parent interface of vlan(4) that is in a bridge member
- vlan(4) is deleted from a bridge member at the detaching

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Added a test about clearing IFF_PROMISC at vlan_unconfig

This test is related to PR/49196

added tests for IFF_PROMISC of vlan(4)

vlan: added checks of linkstate

Added tests for changing a MTU when the vlan(4) is added to bridge(4)

The tests is for PR kern/56292

address to ATF t_vlan failure. adapt ifmcstat(8) output format change.

atf: add test cases for MTU that is increased on SIOCSETVLAN

From t-kusaba@IIJ, thanks

tests: add missing $af

tests: check error messages strictly

tests: reduce repeated phrases... (NFC)

let ATF detect a bug fixed by if_vla.c:r1.132.

Update the error message in t_vlan (ENXIO => EINVAL)

ok ozaki-r@

Add test cases for multicast address handling of vlan(4)

ok ozaki-r@

Add tests of vlan with bridge

The tests trigger a panic reported in PR kern/53357.

Commonalize and add tests of creating/destroying interfaces

Since there was already a test to verify that vlan tag 4096 is
detected as invalid, become the "someone" referred to in the
previous commit log, and add tests for 0 and 4095 as well, and
while here,

Since there was already a test to verify that vlan tag 4096 is
detected as invalid, become the "someone" referred to in the
previous commit log, and add tests for 0 and 4095 as well, and
while here, throw in a few more that might elicit bugs.

And if the shell running the tests is able, add tests of a few
random vlan tags between 2 and 4093 (1 and 4094 are always tested)
to check that anything in range works (well, partially check...)

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Don't attempt to test vlan tags 0 or 4095, which are now rejected
as invalid (perhaps someone could add a test to verify that they
continue to be rejected?)

Add test case of vlan(4)'s re-configure without destroy
(see also if_vlan.c rev. 1.104). Written by s-yamaguchi@iij.

Add a test case for duplicated VLAN ID.

Add counter check to vlan(4) ATF. Implemented by s-yamaguchi@IIJ, thanks.

Add test cases for vlan(4)

From s-yamaguchi@IIJ

Add basic tests for vlan(4)