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mac80211: Fix n-band association problem

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There are two structures named wmm_info and wmm_param, they are used while
parsing the beacon frame. (Check the function ieee802_11_parse_elems).
Certain APs like D-link does not set the fifth bit in WMM IE.
While sending the association request to n-only ap it checks for wmm_ie.
If it is set then only ieee80211_ht_cap is sent during association request.
So n-only association fails.
And this patch fixes this problem by copying the wmm_info to wmm_ie,
which enables the "wmm" flag in iee80211_send_assoc.

Signed-off-by: Abhijeet Kolekar <abhijeet.kolekar@intel.com>
Acked-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Abhijeet Kolekar 2008-04-16 14:02:04 -07:00 committed by John W. Linville
parent d7d313000b
commit a46f025d05
1 changed files with 20 additions and 1 deletions
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21
net/mac80211/mlme.c
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@ -2709,7 +2709,26 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
bss->wmm_ie_len = elems.wmm_param_len + 2;
} else
bss->wmm_ie_len = 0;
} else if (!elems.wmm_param && bss->wmm_ie) {
} else if (elems.wmm_info &&
(!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_info_len ||
memcmp(bss->wmm_ie, elems.wmm_info, elems.wmm_info_len))) {
/* As for certain AP's Fifth bit is not set in WMM IE in
* beacon frames.So while parsing the beacon frame the
* wmm_info structure is used instead of wmm_param.
* wmm_info structure was never used to set bss->wmm_ie.
* This code fixes this problem by copying the WME
* information from wmm_info to bss->wmm_ie and enabling
* n-band association.
*/
kfree(bss->wmm_ie);
bss->wmm_ie = kmalloc(elems.wmm_info_len + 2, GFP_ATOMIC);
if (bss->wmm_ie) {
memcpy(bss->wmm_ie, elems.wmm_info - 2,
elems.wmm_info_len + 2);
bss->wmm_ie_len = elems.wmm_info_len + 2;
} else
bss->wmm_ie_len = 0;
} else if (!elems.wmm_param && !elems.wmm_info && bss->wmm_ie) {
kfree(bss->wmm_ie);
bss->wmm_ie = NULL;
bss->wmm_ie_len = 0;