mac80211: Fix n-band association problem
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>
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1 changed files with 20 additions and 1 deletions
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@ -2709,7 +2709,26 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
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bss->wmm_ie_len = elems.wmm_param_len + 2;
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} else
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bss->wmm_ie_len = 0;
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} else if (!elems.wmm_param && bss->wmm_ie) {
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} else if (elems.wmm_info &&
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(!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_info_len ||
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memcmp(bss->wmm_ie, elems.wmm_info, elems.wmm_info_len))) {
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/* As for certain AP's Fifth bit is not set in WMM IE in
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* beacon frames.So while parsing the beacon frame the
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* wmm_info structure is used instead of wmm_param.
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* wmm_info structure was never used to set bss->wmm_ie.
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* This code fixes this problem by copying the WME
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* information from wmm_info to bss->wmm_ie and enabling
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* n-band association.
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*/
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kfree(bss->wmm_ie);
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bss->wmm_ie = kmalloc(elems.wmm_info_len + 2, GFP_ATOMIC);
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if (bss->wmm_ie) {
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memcpy(bss->wmm_ie, elems.wmm_info - 2,
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elems.wmm_info_len + 2);
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bss->wmm_ie_len = elems.wmm_info_len + 2;
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} else
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bss->wmm_ie_len = 0;
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} else if (!elems.wmm_param && !elems.wmm_info && bss->wmm_ie) {
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kfree(bss->wmm_ie);
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bss->wmm_ie = NULL;
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bss->wmm_ie_len = 0;
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