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

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

I have got confused myself. It should be probe request and not probe 
response.
Mechanism is same but you need to modify ieee80211_probereq_get in tx.c

Br,
Wojtek
> 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
>>
>>
>>
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>
>
>
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