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>
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index df98a8a..9fe1948d 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -527,6 +527,8 @@
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 @@
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 @@
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 @@
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 abc3aa5..63db89a 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1667,6 +1667,57 @@
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 @@
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;
}