[BUG] wpa_supplicant in SAE mode kills AP on same PHY

[Charlemagne Lasse]

Hi,

sorry for sending again but mailing list rejected last mail

I found a weird problem in LEDE 17.01 with an ath9k device and
reported it at https://bugs.lede-project.org/index.php?do=details&task_id=550
. But it looks like it is a bug in hostapd/wpa_supplicant because I
cannot reproduce it when using authsae.

Test setup is a bridge with two devices in it. One encrypted AP and
one encrypted mesh point. Both devices are using the same ath9k phy.

I did the tests with the attached files placed under /va/run/. The
following steps were done. Both hostapd and wpa_supplicant were run on
different terminals

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mkdir -p /var/run/hostapd/

iw phy phy0 interface add ap-2 type managed
ip link set address ac:86:74:00:00:01 dev ap-2
ip link set up dev ap-2

iw phy phy0 interface add mesh-2 type mp
ip link set address ae:86:74:00:00:01 dev mesh-2
ip link set up dev mesh-2

ip link add name br-lan type bridge
brctl addif br-lan mesh-2
ip link set br-lan up


/usr/sbin/hostapd -s -P /var/run/wifi-phy0.pid  /var/run/hostapd-phy0.conf
/usr/sbin/wpa_supplicant -b br-lan -P
/var/run/wpa_supplicant-mesh-2.pid -D nl80211 -i mesh-2 -c
/var/run/wpa_supplicant-mesh-2.conf -C /var/run/wpa_supplicant -H
/var/run/hostapd/ap-2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


The output of iw was following (and the AP didn't work):

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
phy#0
        Interface mesh-2
                ifindex 7
                wdev 0x3
                addr ae:86:74:00:00:01
                type mesh point
                channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
                txpower 20.00 dBm
        Interface ap-2
                ifindex 6
                wdev 0x2
                addr ac:86:74:00:00:01
                type AP
                txpower 20.00 dBm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I tested for a general driver problem by running the test again with
authsae as replacement for wpa_supplicant

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mkdir -p /var/run/hostapd/

iw phy phy0 interface add ap-2 type managed
ip link set address ac:86:74:00:00:01 dev ap-2
ip link set up dev ap-2

iw phy phy0 interface add mesh-2 type mp
ip link set address ae:86:74:00:00:01 dev mesh-2
ip link set up dev mesh-2

ip link add name br-lan type bridge
brctl addif br-lan mesh-2
ip link set br-lan up

/usr/sbin/hostapd -s -P /var/run/wifi-phy0.pid /var/run/hostapd-phy0.conf
/usr/bin/meshd-nl80211 -i mesh-2 -s mymesh -c /var/run/authsae-mesh-2.cfg
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The AP works fine and the iw output is:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
phy#0
        Interface mesh-2
                ifindex 7
                wdev 0x3
                addr ae:86:74:00:00:01
                type mesh point
                channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
                txpower 20.00 dBm
        Interface ap-2
                ifindex 6
                wdev 0x2
                addr ac:86:74:00:00:01
                ssid meshedAP
                type AP
                channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
                txpower 20.00 dBm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


I also tested if the AP works fine before starting wpa_supplicant.
This seems to be the case. It only breaks after starting the
wpa_supplicant.
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