mac80211: 802.11w - SA Query processing

Process SA Query Requests for client mode in mac80211. AP side
processing of SA Query Response frames is in user space (hostapd).

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 83 insertions, 0 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index df98a8a549a2..9fe1948d28d3 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -527,6 +527,8 @@ struct ieee80211_tim_ie {
         u8 virtual_map[0];
 } __attribute__ ((packed));
 
+#define WLAN_SA_QUERY_TR_ID_LEN 16
+
 struct ieee80211_mgmt {
         __le16 frame_control;
         __le16 duration;
@@ -646,6 +648,10 @@ struct ieee80211_mgmt {
                                         u8 action_code;
                                         u8 variable[0];
                                 } __attribute__((packed)) mesh_action;
+                                struct {
+                                        u8 action;
+                                        u8 trans_id[WLAN_SA_QUERY_TR_ID_LEN];
+                                } __attribute__ ((packed)) sa_query;
                         } u;
                 } __attribute__ ((packed)) action;
         } u;
@@ -1041,6 +1047,7 @@ enum ieee80211_category {
         WLAN_CATEGORY_DLS = 2,
         WLAN_CATEGORY_BACK = 3,
         WLAN_CATEGORY_PUBLIC = 4,
+        WLAN_CATEGORY_SA_QUERY = 8,
         WLAN_CATEGORY_WMM = 17,
 };
 
@@ -1129,6 +1136,13 @@ enum ieee80211_back_parties {
         WLAN_BACK_TIMER = 2,
 };
 
+/* SA Query action */
+enum ieee80211_sa_query_action {
+        WLAN_ACTION_SA_QUERY_REQUEST = 0,
+        WLAN_ACTION_SA_QUERY_RESPONSE = 1,
+};
+
+
 /* A-MSDU 802.11n */
 #define IEEE80211_QOS_CONTROL_A_MSDU_PRESENT 0x0080
 
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index abc3aa583ca6..63db89aef3e4 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1667,6 +1667,57 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
         return RX_CONTINUE;
 }
 
+void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
+                                    struct ieee80211_mgmt *mgmt,
+                                    size_t len)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct sk_buff *skb;
+        struct ieee80211_mgmt *resp;
+
+        if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
+                /* Not to own unicast address */
+                return;
+        }
+
+        if (compare_ether_addr(mgmt->sa, sdata->u.sta.bssid) != 0 ||
+            compare_ether_addr(mgmt->bssid, sdata->u.sta.bssid) != 0) {
+                /* Not from the current AP. */
+                return;
+        }
+
+        if (sdata->u.sta.state == IEEE80211_STA_MLME_ASSOCIATE) {
+                /* Association in progress; ignore SA Query */
+                return;
+        }
+
+        if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
+                /* Too short SA Query request frame */
+                return;
+        }
+
+        skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
+        if (skb == NULL)
+                return;
+
+        skb_reserve(skb, local->hw.extra_tx_headroom);
+        resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
+        memset(resp, 0, 24);
+        memcpy(resp->da, mgmt->sa, ETH_ALEN);
+        memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
+        memcpy(resp->bssid, sdata->u.sta.bssid, ETH_ALEN);
+        resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+                                          IEEE80211_STYPE_ACTION);
+        skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
+        resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
+        resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
+        memcpy(resp->u.action.u.sa_query.trans_id,
+               mgmt->u.action.u.sa_query.trans_id,
+               WLAN_SA_QUERY_TR_ID_LEN);
+
+        ieee80211_tx_skb(sdata, skb, 1);
+}
+
 static ieee80211_rx_result debug_noinline
 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 {
@@ -1743,6 +1794,24 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
                         break;
                 }
                 break;
+        case WLAN_CATEGORY_SA_QUERY:
+                if (len < (IEEE80211_MIN_ACTION_SIZE +
+                           sizeof(mgmt->u.action.u.sa_query)))
+                        return RX_DROP_MONITOR;
+                switch (mgmt->u.action.u.sa_query.action) {
+                case WLAN_ACTION_SA_QUERY_REQUEST:
+                        if (sdata->vif.type != NL80211_IFTYPE_STATION)
+                                return RX_DROP_MONITOR;
+                        ieee80211_process_sa_query_req(sdata, mgmt, len);
+                        break;
+                case WLAN_ACTION_SA_QUERY_RESPONSE:
+                        /*
+                         * SA Query response is currently only used in AP mode
+                         * and it is processed in user space.
+                         */
+                        return RX_CONTINUE;
+                }
+                break;
         default:
                 return RX_CONTINUE;
         }