CVS commit: src/sys/net

["Kengo NAKAHARA" <knakahara%netbsd.org@localhost>]

Module Name:    src
Committed By:   knakahara
Date:           Thu Oct 18 11:34:54 UTC 2018

Modified Files:
        src/sys/net: if.c if.h if_vlan.c

Log Message:
fix panic when do ifconfig -vlanif and ifconfig vlanif again. advised by ozaki-r@.

e.g. do the following commands.
    ====================
    # ifconfig vlan0 create
    # ifconfig vlan0 vlan 100 vlanif wm0
    # ifconfig vlan0 -vlanif wm0
    # ifconfig vlan0 vlan 100 vlanif wm0
    ====================

ATF net/if_vlan do this type of test, however it cannot detect this bug.
Because the shmif(4)'s ifp->if_hwdl is always NULL as shmif(4)'s ethernet
address is set U/L bit.
See: https://nxr.netbsd.org/xref/src/sys/net/if_ethersubr.c#997


To generate a diff of this commit:
cvs rdiff -u -r1.436 -r1.437 src/sys/net/if.c
cvs rdiff -u -r1.265 -r1.266 src/sys/net/if.h
cvs rdiff -u -r1.131 -r1.132 src/sys/net/if_vlan.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.