mac80211: count authorized stations per BSS

Currently, each AP interface will send multicast
traffic if any interface has a station entry even
if that station entry is allocated only. With the
new station state management we can easily fix it
by adding a counter that counts each authorized
station only and send multicast traffic only when
the correct interface has at least one authorized
station.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 8df2891..176c08f 100644 (file)
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -321,6 +321,7 @@ static ssize_t ieee80211_if_parse_tkip_mic_test(
 __IEEE80211_IF_FILE_W(tkip_mic_test);
 
 /* AP attributes */
+IEEE80211_IF_FILE(num_sta_authorized, u.ap.num_sta_authorized, ATOMIC);
 IEEE80211_IF_FILE(num_sta_ps, u.ap.num_sta_ps, ATOMIC);
 IEEE80211_IF_FILE(dtim_count, u.ap.dtim_count, DEC);
 
@@ -458,6 +459,7 @@ static void add_ap_files(struct ieee80211_sub_if_data *sdata)
        DEBUGFS_ADD(rc_rateidx_mask_2ghz);
        DEBUGFS_ADD(rc_rateidx_mask_5ghz);
 
+       DEBUGFS_ADD(num_sta_authorized);
        DEBUGFS_ADD(num_sta_ps);
        DEBUGFS_ADD(dtim_count);
        DEBUGFS_ADD(num_buffered_multicast);

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 96fe754..9516c30 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -243,6 +243,7 @@ struct ieee80211_if_ap {
        u8 tim[sizeof(unsigned long) * BITS_TO_LONGS(IEEE80211_MAX_AID + 1)];
        struct sk_buff_head ps_bc_buf;
        atomic_t num_sta_ps; /* number of stations in PS mode */
+       atomic_t num_sta_authorized; /* number of authorized stations */
        int dtim_count;
        bool dtim_bc_mc;
 };

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index b22775c..141315c 100644 (file)
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1567,17 +1567,21 @@ int sta_info_move_state_checked(struct sta_info *sta,
                        return -EINVAL;
                break;
        case IEEE80211_STA_ASSOC:
-               if (sta->sta_state == IEEE80211_STA_AUTH)
+               if (sta->sta_state == IEEE80211_STA_AUTH) {
                        set_bit(WLAN_STA_ASSOC, &sta->_flags);
-               else if (sta->sta_state == IEEE80211_STA_AUTHORIZED)
+               } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
+                       if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
+                               atomic_dec(&sta->sdata->u.ap.num_sta_authorized);
                        clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
-               else
+               } else
                        return -EINVAL;
                break;
        case IEEE80211_STA_AUTHORIZED:
-               if (sta->sta_state == IEEE80211_STA_ASSOC)
+               if (sta->sta_state == IEEE80211_STA_ASSOC) {
+                       if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
+                               atomic_inc(&sta->sdata->u.ap.num_sta_authorized);
                        set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
-               else
+               } else
                        return -EINVAL;
                break;
        default:

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 50c4be9..6bbd6cc 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -304,17 +304,14 @@ ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
                        I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
                        return TX_DROP;
                }
-       } else {
-               if (unlikely(ieee80211_is_data(hdr->frame_control) &&
-                            tx->local->num_sta == 0 &&
-                            tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
-                       /*
-                        * No associated STAs - no need to send multicast
-                        * frames.
-                        */
-                       return TX_DROP;
-               }
-               return TX_CONTINUE;
+       } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
+                           ieee80211_is_data(hdr->frame_control) &&
+                           !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) {
+               /*
+                * No associated STAs - no need to send multicast
+                * frames.
+                */
+               return TX_DROP;
        }
 
        return TX_CONTINUE;