WPA supplicant in adhoc mode

LAMBA Jaideep Jaideep.Lamba at alcatel-lucent.com
Mon Dec 21 15:44:34 EST 2009


I am running into the MLME-REPLAYFAILURE issues with wpa_supplicant in
adhoc mode with madwifi drivers.
 
My configuration file looks like 
#IBSS/ad-hoc network with WPA-NONE/TKIP
ctrl_interface=/var/run/wpa_supplicant
ap_scan=2
network={
        ssid="AODV_TEST"
#       scan_ssid=1
        mode=1
#        auth_alg=OPEN
        frequency=2412
        proto=WPA
        key_mgmt=WPA-NONE
        pairwise=CCMP
        group=CCMP
        psk="testing123"
}

Test scenario: Start wpa_supplicant on A (hosts) and node B (hosts).
Test the communication between A and B. Now disconnect B for 5 mins and
restart wpa_supplicant on B. And you will start seeing 
WEXT: Custom wireless event: 'MLME-REPLAYFAILURE.indication(keyid=0
unicast addr=00:15:6d:64:ec:cd)'
Ignore event for foreign ifindex 25
RTM_NEWLINK: operstate=1 ifi_flags=0x11043 ([UP][RUNNING][LOWER_UP])
Wireless event: cmd=0x8c02 len=85

This goes on for some time and then the two devices can talk together.
This event is getting generated in ccmp_decap function. After adding the
following printf statement
 
    if (pn && pn <= k->wk_keyrsc[tid]) {
        /*
         * Replay violation.
         */
        IEEE80211_DPRINTF(ctx->cc_vap, IEEE80211_MSG_CRYPTO,"%s: pn=%d
tid=%d, QOS_HAS_SEQ=%s keysrc = %d \n",
            __func__, pn,tid,IEEE80211_QOS_HAS_SEQ(wh) ? "TRUE" :
"FALSE",k->wk_keyrsc[tid]);
        ieee80211_notify_replay_failure(vap, wh, k, pn);
        vap->iv_stats.is_rx_ccmpreplay++;
        return 0;
    }

I get the following log messages.
wifi0/ath0[00:15:6d:64:ec:c0]: ccmp_decap: pn=45 tid=0,
QOS_HAS_SEQ=FALSE keysrc = 372
wifi0/ath0[00:15:6d:64:ec:c0]: 00:15:6d:64:ec:d6 AES-CCM replay detected
<keyix 0, rsc 45 >

Can somebody please point me to what am I missing here. 
 
Thanks,
Jaideep
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.shmoo.com/pipermail/hostap/attachments/20091221/bd19d1a2/attachment.htm 


More information about the HostAP mailing list