• Krishna Kumar's avatar
    ip6_pol_route panic: Do not allow VLAN on loopback · 0553c891
    Krishna Kumar authored
    Several tests in the ipv6 routing code check IFF_LOOPBACK, and
    allowing stacking such as VLAN'ing on top of loopback results in a
    netdevice which reports IFF_LOOPBACK but really isn't the loopback
    device.
    
    Instead of spamming the ipv6 routing code with even more special tests,
    simply disallow VLAN over loopback.
    
    The result of this patch is:
    
    # modprobe 8021q
    # vconfig add lo 43
    ERROR: trying to add VLAN #43 to IF -:lo:-  error: Operation not supported
    Signed-off-by: default avatarKrishna Kumar <krkumar2@in.ibm.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    0553c891
loopback.c 5.34 KB