mac80211: make BA session handling independent of STA mode

The aggregation handling isn't dependent on anything related to our
STA-mode implementation, and doesn't need to depend on it for frame
processing. This patch moves the relevant code to ht.c and adds a
hook in rx.c. For now, the relevant action frames are only processed
in STA/IBSS modes, but that's now something we can easily change.

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

1 files changed, 60 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 7e09b30dd393..71cce0bcc5be 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1511,6 +1511,65 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
 }
 
 static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
+{
+        struct ieee80211_local *local = rx->local;
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
+        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+        int len = rx->skb->len;
+
+        if (!ieee80211_is_action(mgmt->frame_control))
+                return RX_CONTINUE;
+
+        if (!rx->sta)
+                return RX_DROP_MONITOR;
+
+        if (!(rx->flags & IEEE80211_RX_RA_MATCH))
+                return RX_DROP_MONITOR;
+
+        /* all categories we currently handle have action_code */
+        if (len < IEEE80211_MIN_ACTION_SIZE + 1)
+                return RX_DROP_MONITOR;
+
+        /*
+         * FIXME: revisit this, I'm sure we should handle most
+         *        of these frames in other modes as well!
+         */
+        if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
+            sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
+                return RX_DROP_MONITOR;
+
+        switch (mgmt->u.action.category) {
+        case WLAN_CATEGORY_BACK:
+                switch (mgmt->u.action.u.addba_req.action_code) {
+                case WLAN_ACTION_ADDBA_REQ:
+                        if (len < (IEEE80211_MIN_ACTION_SIZE +
+                                   sizeof(mgmt->u.action.u.addba_req)))
+                                return RX_DROP_MONITOR;
+                        ieee80211_process_addba_request(local, rx->sta, mgmt, len);
+                        break;
+                case WLAN_ACTION_ADDBA_RESP:
+                        if (len < (IEEE80211_MIN_ACTION_SIZE +
+                                   sizeof(mgmt->u.action.u.addba_resp)))
+                                return RX_DROP_MONITOR;
+                        ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
+                        break;
+                case WLAN_ACTION_DELBA:
+                        if (len < (IEEE80211_MIN_ACTION_SIZE +
+                                   sizeof(mgmt->u.action.u.delba)))
+                                return RX_DROP_MONITOR;
+                        ieee80211_process_delba(sdata, rx->sta, mgmt, len);
+                        break;
+                }
+                rx->sta->rx_packets++;
+                dev_kfree_skb(rx->skb);
+                return RX_QUEUED;
+        }
+
+        return RX_CONTINUE;
+}
+
+static ieee80211_rx_result debug_noinline
 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
 {
         struct ieee80211_sub_if_data *sdata;
@@ -1689,6 +1748,7 @@ static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
                 CALL_RXH(ieee80211_rx_h_mesh_fwding);
         CALL_RXH(ieee80211_rx_h_data)
         CALL_RXH(ieee80211_rx_h_ctrl)
+        CALL_RXH(ieee80211_rx_h_action)
         CALL_RXH(ieee80211_rx_h_mgmt)
 
 #undef CALL_RXH