[ath9k-devel] Set vendor specific element ID in probe request

[Wojciech Dubowik <Wojciech.Dubowik@neratec.com>]

On 06/11/2012 01:07 PM, Amith Belur wrote:
> Help needed, newbie here. I am trying to find how to set vendor 
> specific element id in probe request and I am not quite clear how to 
> do this. Any pointers would be really helpful.

I have used changes below to send vendor data in probe responses. It's 
in mac80211 so you can
use it with other drivers as well i.e. mac80211_hwsim.

vendor_data_oui is just debugfs entry but you might just get rid of this 
and add your own control.
At the moment I am using 16-bit for data but you can send what you want. 
Just add your struct
instead of vendor_data_value and change IE length.

This is just part of my testing patchest and it hasn't been reviewed, 
cleaned, etc. I have also patch to send
vendor data in beacons based on debugfs entries (fast) or through 
hostapd (slow). I don't plan to publish
them unless there is general interest in it. It's "vendor specific" so 
applications and means of control can
vary...

Br,
Wojtek

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 4b1319b..ac58a1b 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1465,6 +1465,7 @@ void ieee80211_xmit(struct ieee80211_sub_if_data 
*sdata, struct sk_buff *skb)
      struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
      int headroom;
      bool may_encrypt;
+    u8 *pos;

      rcu_read_lock();

@@ -1485,6 +1486,32 @@ void ieee80211_xmit(struct ieee80211_sub_if_data 
*sdata, struct sk_buff *skb)
      hdr = (struct ieee80211_hdr *) skb->data;
      info->control.vif = &sdata->vif;

+    /* Add vendor specific data to probe response (if present) */
+    if (ieee80211_is_probe_resp(hdr->frame_control) &&
+        !(info->control.vif->bss_conf.vendor_data_oui[0] == 0 &&
+        info->control.vif->bss_conf.vendor_data_oui[1] == 0 &&
+        info->control.vif->bss_conf.vendor_data_oui[2] == 0)) {
+
+            if (skb->end - skb->tail < 8)
+                pskb_expand_head(skb, 0, 8, GFP_ATOMIC);
+
+            if (skb->end - skb->tail > 8) {
+                pos = (u8 *) skb_put(skb, 8);
+                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
+                *pos++ = 3 + 1 + 2; /* oui, type, data16 */
+                memcpy(pos, info->control.vif->bss_conf.vendor_data_oui,
+                        
sizeof(info->control.vif->bss_conf.vendor_data_oui));
+                pos += sizeof(info->control.vif->bss_conf.vendor_data_oui);
+                *pos++ = info->control.vif->bss_conf.vendor_data_type;
+                memcpy(pos, &info->control.vif->bss_conf.vendor_data_value,
+                        
sizeof(info->control.vif->bss_conf.vendor_data_value));
+            } else {
+                printk(KERN_DEBUG "%s: Unable to add vendor data to 
probe response"
+                                   " directed to %pM\n", sdata->name,
+                                   hdr->addr1);
+            }
+    }
+
      if (ieee80211_vif_is_mesh(&sdata->vif) &&
          ieee80211_is_data(hdr->frame_control) &&
          !is_multicast_ether_addr(hdr->addr1) &&
>
> Thanks
>
> -- 
> Best Regards,
> Amith
>
>
>
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel

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