Patch proposal hostapd-nl80211: Multi bridge VLAN

Maxence Dalmais maxence.dalmais
Wed Nov 25 06:27:27 PST 2009

Hi folks,

I am actually working on getting fully functionnal dynamic vlan (not full
dynamic) with nl80211 driver while virtual interfaces are in a brigde.

The already known problem is that the EAPOL packet are not processed by
hostapd when the interface on wich the packet is received is in a bridge.
I propose that we could add not only one interface in the bridge section in
the hostapd.conf file but a list.

For example :
bridge=br1 br2 br3

The modification I propose are on the src/driver_nl80211.c file.
You could find attached the modification I propose to get this comportement.
I think this should be move to the config.c file but I was scary that it had
repercution on others drivers.

The bridge list cannot be longer than IFNAMSIZ (16) so be careful.
I didn't see any other failure in the behavior.
The EAP hand-check now works and the packet are forwarded on the good

Please feel free to comment

diff -ur hostapd-0.7.0-ori/hostapd-0.7.0/src/drivers/driver_nl80211.c
--- hostapd-0.7.0-ori/hostapd-0.7.0/src/drivers/driver_nl80211.c
2009-11-21 21:49:02.000000000 +0100
+++ hostapd-0.7.0/src/drivers/driver_nl80211.c    2009-11-25
15:39:20.000000000 +0100
@@ -4418,8 +4418,19@
     drv->num_if_indices = sizeof(drv->default_if_indices) / sizeof(int);
     drv->if_indices = drv->default_if_indices;
     for (i = 0; i < params->num_bridge; i++) {
-        if (params->bridge[i])
-            add_ifidx(drv, if_nametoindex(params->bridge[i]));
+        if (params->bridge[i]){
+            char * brname=params->bridge[i];
+            char *pos=brname;
+            while (*pos != '\0') {
+                if (*pos == ' ') {
+                    *pos = '\0';
+                    add_ifidx(drv, if_nametoindex(brname));
+                    brname=pos+1;
+                    }
+                pos++;
+            }
+            add_ifidx(drv, if_nametoindex(brname));
+        }

     /* start listening for EAPOL on the default AP interface */_
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