mac80211: Allow noack flag overwrite for injected frames

Allow injected unicast frames to be sent without having to wait
for an ACK.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 14 insertions, 2 deletions

diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index b0be5fb9de19..7e2c4d483ad0 100644
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -251,6 +251,7 @@ enum ieee80211_radiotap_type {
                                                  * retries */
 #define IEEE80211_RADIOTAP_F_TX_CTS     0x0002  /* used cts 'protection' */
 #define IEEE80211_RADIOTAP_F_TX_RTS     0x0004  /* used rts/cts handshake */
+#define IEEE80211_RADIOTAP_F_TX_NOACK   0x0008  /* don't expect an ack */
 
 
 /* For IEEE80211_RADIOTAP_MCS */
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index ae5dd85f1e93..ad2ee4a90ec4 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1054,6 +1054,7 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
                                                    NULL);
+        u16 txflags;
 
         info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
         tx->flags &= ~IEEE80211_TX_FRAGMENTED;
@@ -1102,6 +1103,13 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
                                 tx->flags |= IEEE80211_TX_FRAGMENTED;
                         break;
 
+                case IEEE80211_RADIOTAP_TX_FLAGS:
+                        txflags = le16_to_cpu(get_unaligned((__le16*)
+                                                iterator.this_arg));
+                        if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
+                                info->flags |= IEEE80211_TX_CTL_NO_ACK;
+                        break;
+
                 /*
                  * Please update the file
                  * Documentation/networking/mac80211-injection.txt
@@ -1266,8 +1274,11 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
                 tx->flags |= IEEE80211_TX_UNICAST;
                 if (unlikely(local->wifi_wme_noack_test))
                         info->flags |= IEEE80211_TX_CTL_NO_ACK;
-                else
-                        info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
+                /*
+                 * Flags are initialized to 0. Hence, no need to
+                 * explicitly unset IEEE80211_TX_CTL_NO_ACK since
+                 * it might already be set for injected frames.
+                 */
         }
 
         if (tx->flags & IEEE80211_TX_FRAGMENTED) {