Documentation/cImages/baseline-8.3.ndz: patch-01-ibss-fix.diff

net80211/ieee80211_node.c

@@ -53 +53 @@
 #include <net80211/ieee80211_var.h>
 #include <net80211/if_athproto.h>
 
+static int ibss_grid = 1;
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,52))
+MODULE_PARM(ibss_grid, "i");
+#else
+#include <linux/moduleparam.h>
+module_param(ibss_grid, int, 0600);
+#endif
+MODULE_PARM_DESC(ibss_grid, "IBSS hack based on SSID for large networks");
+
+
 /*
  * Association IDs are managed with a bit vector.
  */
@@ -345 +355 @@
         if (vap->iv_flags & IEEE80211_F_DESBSSID) {
             IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
             IEEE80211_ADDR_COPY(vap->iv_bssid, vap->iv_des_bssid);
-        } else {
-            ni->ni_bssid[0] |= 0x02;    /* local bit for IBSS */
-            vap->iv_bssid[0] |= 0x02;
-        }
+               } else {
+            /* XXX: If we're on a large network then hash the SSID
+            * instead of the MAC address to generate the BSSID.
+            * This ensures that nodes with identical SSIDs end
+            * up with identical BSSIDs, regardless of any 
+            * timing bugs. We might be able to fix this for good
+            * elsewhere */
+            if(ibss_grid) {
+                int i;
+                printk(KERN_INFO "net80211: IBSS BSSID "
+                    "generation based on hash of SSID - "
+                    "temporary fix for large networks\n");
+                for(i=0; i<IEEE80211_ADDR_LEN;i++)
+                    ni->ni_bssid[i] = ni->ni_essid[i % 
+                        ni->ni_esslen];
+            }
+                       else {
+                ni->ni_bssid[0] |= 0x02;/* local bit for IBSS */
+                    vap->iv_bssid[0] |= 0x02;
+            }
+               }
+
     } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
         if (vap->iv_flags & IEEE80211_F_DESBSSID) {
             IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);