mac80211: simplify association HT parameters
authorJohannes Berg <johannes.berg@intel.com>
Wed, 16 May 2012 21:43:19 +0000 (23:43 +0200)
committerJohn W. Linville <linville@tuxdriver.com>
Tue, 5 Jun 2012 19:32:15 +0000 (15:32 -0400)
Instead of passing around the entire HT information
IE, extract only the HT parameters field and disable
HT if the HT information IE isn't present and well-
formed.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
net/mac80211/ieee80211_i.h
net/mac80211/mlme.c

index 3f3cd50..8c026ab 100644 (file)
@@ -399,7 +399,6 @@ struct ieee80211_mgd_auth_data {
 struct ieee80211_mgd_assoc_data {
        struct cfg80211_bss *bss;
        const u8 *supp_rates;
-       const u8 *ht_operation_ie;
 
        unsigned long timeout;
        int tries;
@@ -414,6 +413,8 @@ struct ieee80211_mgd_assoc_data {
        bool sent_assoc;
        bool synced;
 
+       u8 ap_ht_param;
+
        size_t ie_len;
        u8 ie[];
 };
index 0c4e26f..7c07715 100644 (file)
@@ -258,12 +258,11 @@ static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 }
 
 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
-                               struct sk_buff *skb, const u8 *ht_oper_ie,
+                               struct sk_buff *skb, u8 ap_ht_param,
                                struct ieee80211_supported_band *sband,
                                struct ieee80211_channel *channel,
                                enum ieee80211_smps_mode smps)
 {
-       struct ieee80211_ht_operation *ht_oper;
        u8 *pos;
        u32 flags = channel->flags;
        u16 cap;
@@ -271,21 +270,13 @@ static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 
        BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 
-       if (!ht_oper_ie)
-               return;
-
-       if (ht_oper_ie[1] < sizeof(struct ieee80211_ht_operation))
-               return;
-
        memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
        ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 
-       ht_oper = (struct ieee80211_ht_operation *)(ht_oper_ie + 2);
-
        /* determine capability flags */
        cap = ht_cap.cap;
 
-       switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
+       switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
@@ -509,7 +500,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
        }
 
        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
-               ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_operation_ie,
+               ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
                                    sband, local->oper_channel, ifmgd->ap_smps);
 
        /* if present, add any custom non-vendor IEs that go after HT */
@@ -3260,7 +3251,7 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
        struct ieee80211_bss *bss = (void *)req->bss->priv;
        struct ieee80211_mgd_assoc_data *assoc_data;
        struct ieee80211_supported_band *sband;
-       const u8 *ssidie;
+       const u8 *ssidie, *ht_ie;
        int i, err;
 
        ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
@@ -3347,8 +3338,13 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
                          (local->hw.queues >= IEEE80211_NUM_ACS);
        assoc_data->supp_rates = bss->supp_rates;
        assoc_data->supp_rates_len = bss->supp_rates_len;
-       assoc_data->ht_operation_ie =
-               ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
+
+       ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
+       if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
+               assoc_data->ap_ht_param =
+                       ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
+       else
+               ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
 
        if (bss->wmm_used && bss->uapsd_supported &&
            (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {