Hi all,
I have some question related to defined value. In ieee80211.h there is
#define IEEE80211_QOS_CTL_ACK_POLICY_NORMAL 0x0000
#define IEEE80211_QOS_CTL_ACK_POLICY_NOACK 0x0020
#define IEEE80211_QOS_CTL_ACK_POLICY_NO_EXPL 0x0040
#define IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK 0x0060
But there is none of the any other void try to call the following 3 deintions
(what i mean is that they are never used)
IEEE80211_QOS_CTL_ACK_POLICY_NORMAL,
IEEE80211_QOS_CTL_ACK_POLICY_NO_EXPL,
IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK
in the whole driver folder. And for the IEEE80211_QOS_CTL_ACK_POLICY_NOACK
it appears in wme.c in the following function.
void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff
*skb)
{
struct ieee80211_hdr *hdr = (void *)skb->data;
/* Fill in the QoS header if there is one. */
if (ieee80211_is_data_qos(hdr->frame_control)) {
u8 *p = ieee80211_get_qos_ctl(hdr);
u8 ack_policy = 0, tid;
tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
if (unlikely(local->wifi_wme_noack_test))
ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
/* qos header is 2 bytes, second reserved */
*p++ = ack_policy | tid;
*p = 0;
}
}
I am just wondering how to modify the policy if there is only one policy
that is in operation. When I used raw socket to send out packet, the
policy that filled in side the packet is "normal ack".
For normal ACK, there is 0 in the QoS header, and u8 ack_policy = 0
implies normal ACK. But when I modify this void by adding a line after the
"tid= ..."
ack_policy|=IEEE80211_QOS_CTL_ACK_POLICY_NOACK ;
And compile the driver again, it doesn't do me a favour.
Actually my target is to set a policy that all qos data from normal_ack
packet to no_ack. Or am i in wrong direction? Thanks for help.
Regards,
Jax
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