[PATCH 1/1] P2P: Ignore RTM_NEWLINK event for the P2P Discovery Interface

[Jithu Jance]

Hi Jouni/Dmitry,

I applied the logic of the commit:147848ec4d26613d5a117d4b35dbc7ff98dd65d1
to wpa_driver_nl80211_if_add function as well. Please see whether this
patch is fine.

Signed-off-by: Jithu Jance <jithu at broadcom.com>
---
 src/drivers/driver_nl80211.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 7568653..baef09d 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -10177,8 +10177,16 @@ static int wpa_driver_nl80211_if_add(void
*priv, enum wpa_driver_if_type type,
  if (drv->global)
  drv->global->if_add_ifindex = ifidx;

- if (ifidx > 0)
+ /*
+ * Some virtual interfaces need to process EAPOL packets and events on
+ * the parent interface. This is used mainly with hostapd.
+ */
+ if ((ifidx > 0) && (drv->hostapd ||
+    nlmode == NL80211_IFTYPE_AP_VLAN ||
+    nlmode == NL80211_IFTYPE_WDS ||
+    nlmode == NL80211_IFTYPE_MONITOR)) {
  add_ifidx(drv, ifidx);
+ }

  return 0;
 }
--
1.7.9.5



> Jithu Jance





On Sat, Jun 14, 2014 at 7:34 PM, Jithu Jance <jithujance at gmail.com> wrote:
> Hi Dmitry & Jouni,
>
> Thanks for looking into this. I think I didn't dig deep enough. I will
> also check this and try to come up with a patch to address this.
>
>
> Thanks,
>
>
>
>> Jithu Jance
>
>
>
>
>
> On Sat, Jun 14, 2014 at 5:18 AM, Dmitry Shmidt <dimitrysh at google.com> wrote:
>> On Fri, Jun 13, 2014 at 4:10 PM, Dmitry Shmidt <dimitrysh at google.com> wrote:
>>> On Wed, Jun 11, 2014 at 2:30 PM, Jouni Malinen <j at w1.fi> wrote:
>>>> On Mon, Jun 09, 2014 at 01:26:42AM -0700, Jithu Jance wrote:
>>>>> Patch for Ignoring the RTM event for the dedicated P2P discovery
>>>>> Interface. Without the patch the IFFUP operation on the interface
>>>>> was failing (since there is no network device associated with the
>>>>> interface).
>>>>
>>>>> +     if (drv->nlmode == NL80211_IFTYPE_P2P_DEVICE) {
>>>>> +             wpa_printf(MSG_INFO, "nl80211: Ignore RTM_NEWLINK for P2P Discovery Interface");
>>>>> +             return;
>>>>> +     }
>>>>
>>>> Hmm.. How does NL82011_IFTYPE_P2P_DEVICE even get a RTM_NEWLINK event?
>>>> The main point of that was to not have a netdev.. Could you please share
>>>> a debug log showing what this looks like without this change?
>>>
>>> I think RTM_NEWLINK is received for group interface but this code fails it:
>>>
>>> if (!drv->if_disabled && !(ifi->ifi_flags & IFF_UP)) {
>>>                 if (if_indextoname(ifi->ifi_index, namebuf) &&
>>>                     linux_iface_up(drv->global->ioctl_sock,
>>>                                    drv->first_bss->ifname) > 0) {  <<<< Here !!!
>>>                         wpa_printf(MSG_DEBUG, "nl80211: Ignore interface down "
>>>                                    "event since interface %s is up", namebuf);
>>>                         return;
>>>                 }
>>>                 wpa_printf(MSG_DEBUG, "nl80211: Interface down");
>>>
>>>
>>> Because namebuf == p2p-wlan0-0 and drv->first_bss->ifname == p2p-dev-wlan0,
>>> where p2p-wlan0-0 is group interface, and p2p-dev-wlan0 is Non-NETDEV p2p.
>>
>> It looks like this change
>>   http://hostap.epitest.fi/cgit/hostap/commit/?id=b36935be1a14341771b0fd5491808c3f6fdcb603
>> causes nl80211_find_drv() to return wrong pointer.
>>
>>>
>>>>
>>>> --
>>>> Jouni Malinen                                            PGP id EFC895FA
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