[pkg-wpa-devel] Bug#363347: wpasupplicant: ifdown doesn't work correctly when using wpacli-action-dhclient script

[Felix Homann]

retitle 363347 wpacli-action-dhclient breaks ifdown and thereby ifup and zeroconf
severity 363347  important
quit

After further investigaion I found that the described behaviour has a major effect on 
ifup and zeroconf as well. I therefore rename the bug and increase its severity.

Here's what happens.

1. Effect on ifup
=========

Bring the interface up once, then ifdown it. Subsequent ifups will be successful even if 
they should fail (if e.g. the AP is unreachable or you turned your radio off). ifconfig will 
show the interface as configured with the old IP.

2. Effect on zeroconf
=============

If you configure zeroconf to be used as fallback only it will only allocate a Link Local address
if there isn't already an IP address in the global scope:

---------------------------------------------
# From /etc/network/if-up.d/zeroconf:
# should we only allocate an address if we do not already have one?
if [ -n "$FALLBACK" ]; then
    /bin/ip addr show $IFACE scope global | grep -q "inet"
    IP=$?
    if [ $IP -eq 0 ]; then
        /bin/ip route add 169.254.0.0/16 dev $IFACE
        exit 0
    fi
fi
---------------------------------------------

If the interface isn't brought down correctly zeroconf will never allocate a LL address.

Regards,

Felix