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<p class="MsoNormal">I am using wpa_supplicant on Edison platform (kernel 3.10.17)<o:p></o:p></p>
<p class="MsoNormal">and I have an issue with the group negociation when Edison device
<o:p></o:p></p>
<p class="MsoNormal">tries to become GO (intent value is 15).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When the P2P virtual group interface is created and first action frame sent,
<o:p></o:p></p>
<p class="MsoNormal">I have the event RTM_NEWLINKwith the interface state not yet UP since the group negociation<o:p></o:p></p>
<p class="MsoNormal">is not yet completed. See trace below :<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> .....<o:p></o:p></p>
<p class="MsoNormal"> nl80211: Frame TX command accepted; cookie 0x6<o:p></o:p></p>
<p class="MsoNormal"> RTM_NEWLINK: ifi_index=17 ifname=p2p-wlan0-0 operstate=2 linkmode=0 ifi_flags=0x1002 ()<o:p></o:p></p>
<p class="MsoNormal"> Could not read interface p2p-dev-wlan0 flags : No such device<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The problem is that the rest of processing in this situation shuts down the interface<o:p></o:p></p>
<p class="MsoNormal">and group negociation fails.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The current WLAN driver/chipset on Edison, works fine one platform Android/Kitkat 4.4.2.
<o:p></o:p></p>
<p class="MsoNormal">On Android, for the same sequence, I have the below traces :<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> .....<o:p></o:p></p>
<p class="MsoNormal"> nl80211: Frame TX command accepted; cookie 0x9<o:p></o:p></p>
<p class="MsoNormal"> nl80211: Ignore RTM_NEWLINK event for foreign ifindex 5<o:p></o:p></p>
<p class="MsoNormal"> ......<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">By looking at the diff between the 2 supplicants, I can see one diff related to the above<o:p></o:p></p>
<p class="MsoNormal">traces. The function have_ifidx() always returns 0 on Android and the codes is only built under flag HOSTAPD.<o:p></o:p></p>
<p class="MsoNormal">Now, when I apply this small patch to the Linux wpa_supplicant 2.2, the group negociation works fine<o:p></o:p></p>
<p class="MsoNormal">(I have the above trace "Ignore ...", the interface becomes UP after negociation) but the side-effect is that
<o:p></o:p></p>
<p class="MsoNormal">the wpa_supplicant 2.2 crashes on "wpa_cli p2p_group_remove ...".<o:p></o:p></p>
<p class="MsoNormal">There is memory corruption that makes the sendto() on wpa_cli unix socket
<o:p></o:p></p>
<p class="MsoNormal">crashing when sending the response after the removal.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am wondering who is faultly in this case.<o:p></o:p></p>
<p class="MsoNormal">Is there a bug in wpa_supplicant 2.2 regarding have_ifidx() vs P2P sequence or
<o:p></o:p></p>
<p class="MsoNormal">there would be an issue in the driver regarding the state of P2P virtual group interface ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance,<o:p></o:p></p>
<p class="MsoNormal"> Franck<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p>---------------------------------------------------------------------<br>
Intel Corporation SAS (French simplified joint stock company)<br>
Registered headquarters: "Les Montalets"- 2, rue de Paris, <br>
92196 Meudon Cedex, France<br>
Registration Number: 302 456 199 R.C.S. NANTERRE<br>
Capital: 4,572,000 Euros</p>
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