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authorJohannes Berg <johannes@sipsolutions.net>2010-01-17 01:47:59 +0100
committerJohn W. Linville <linville@tuxdriver.com>2010-01-19 16:25:21 -0500
commitc6fcf6bcfc3cfc1c00cc7fd9610cfa2b1a18041f (patch)
tree301713d3f65f3cc9cb99e374c655d6f8bf99c741 /net/mac80211
parent813d76694043d00b59475baa1fbfaf54a2eb7fad (diff)
mac80211: re-enable re-transmission of filtered frames
In an earlier commit, mac80211: disable software retry for now Pavel Roskin reported a problem that seems to be due to software retry of already transmitted frames. It turns out that we've never done that correctly, but due to some recent changes it now crashes in the TX code. I've added a comment in the patch that explains the problem better and also points to possible solutions -- which I can't implement right now. I disabled software retry of failed/filtered frames because it was broken. With the work of the previous patches, it now becomes fairly easy to re-enable it by adding a flag indicating that the frame shouldn't be modified, but still running it through the transmit handlers to populate the control information. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/status.c32
-rw-r--r--net/mac80211/tx.c7
2 files changed, 11 insertions, 28 deletions
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 9e171b17827..800b6777e0e 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -45,37 +45,16 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
/*
- * XXX: This is temporary!
- *
- * The problem here is that when we get here, the driver will
- * quite likely have pretty much overwritten info->control by
- * using info->driver_data or info->rate_driver_data. Thus,
- * when passing out the frame to the driver again, we would be
- * passing completely bogus data since the driver would then
- * expect a properly filled info->control. In mac80211 itself
- * the same problem occurs, since we need info->control.vif
- * internally.
- *
- * To fix this, we should send the frame through TX processing
- * again. However, it's not that simple, since the frame will
- * have been software-encrypted (if applicable) already, and
- * encrypting it again doesn't do much good. So to properly do
- * that, we not only have to skip the actual 'raw' encryption
- * (key selection etc. still has to be done!) but also the
- * sequence number assignment since that impacts the crypto
- * encapsulation, of course.
- *
- * Hence, for now, fix the bug by just dropping the frame.
- */
- goto drop;
-
- /*
* This skb 'survived' a round-trip through the driver, and
* hopefully the driver didn't mangle it too badly. However,
* we can definitely not rely on the the control information
- * being correct. Clear it so we don't get junk there.
+ * being correct. Clear it so we don't get junk there, and
+ * indicate that it needs new processing, but must not be
+ * modified/encrypted again.
*/
memset(&info->control, 0, sizeof(info->control));
+ info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
+ IEEE80211_TX_INTFL_RETRANSMISSION;
sta->tx_filtered_count++;
@@ -130,7 +109,6 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
return;
}
- drop:
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit())
printk(KERN_DEBUG "%s: dropped TX filtered frame, "
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index e3d8ff533ee..da557b0d011 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1285,6 +1285,7 @@ static int __ieee80211_tx(struct ieee80211_local *local,
static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
{
struct sk_buff *skb = tx->skb;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
ieee80211_tx_result res = TX_DROP;
#define CALL_TXH(txh) \
@@ -1299,9 +1300,13 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
CALL_TXH(ieee80211_tx_h_ps_buf);
CALL_TXH(ieee80211_tx_h_select_key);
CALL_TXH(ieee80211_tx_h_sta);
- CALL_TXH(ieee80211_tx_h_michael_mic_add);
if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
CALL_TXH(ieee80211_tx_h_rate_ctrl);
+
+ if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
+ goto txh_done;
+
+ CALL_TXH(ieee80211_tx_h_michael_mic_add);
CALL_TXH(ieee80211_tx_h_sequence);
CALL_TXH(ieee80211_tx_h_fragment);
/* handlers after fragment must be aware of tx info fragmentation! */