2013-05-17 11:41:28

by Stanislaw Gruszka

Subject: [PATCH 3.10] mac80211: fix direct probe auth

We send direct probe to broadcast address, as some APs do not respond to
unicast PROBE frames when unassociated. Broadcast frames are not acked,
so we can not use that for trigger MLME state machine, but we need to
use old timeout mechanism.

This fixes authentication timed out like below:

[ 1024.671974] wlan6: authenticate with 54:e6:fc:98:63:fe
[ 1024.694125] wlan6: direct probe to 54:e6:fc:98:63:fe (try 1/3)
[ 1024.695450] wlan6: direct probe to 54:e6:fc:98:63:fe (try 2/3)
[ 1024.700586] wlan6: send auth to 54:e6:fc:98:63:fe (try 3/3)
[ 1024.701441] wlan6: authentication with 54:e6:fc:98:63:fe timed out

With fix, we have:

[ 4524.198978] wlan6: authenticate with 54:e6:fc:98:63:fe
[ 4524.220692] wlan6: direct probe to 54:e6:fc:98:63:fe (try 1/3)
[ 4524.421784] wlan6: send auth to 54:e6:fc:98:63:fe (try 2/3)
[ 4524.423272] wlan6: authenticated
[ 4524.423811] wlan6: associate with 54:e6:fc:98:63:fe (try 1/3)
[ 4524.427492] wlan6: RX AssocResp from 54:e6:fc:98:63:fe (capab=0x431 status=0 aid=1)

Cc: [email protected] # 3.9
Signed-off-by: Stanislaw Gruszka <[email protected]>
---
net/mac80211/mlme.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 346ad4c..0a60f40 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3182,10 +3182,6 @@ static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
if (WARN_ON_ONCE(!auth_data))
return -EINVAL;

- if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
- tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
- IEEE80211_TX_INTFL_MLME_CONN_TX;
-
auth_data->tries++;

if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
@@ -3219,6 +3215,10 @@ static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
auth_data->expected_transaction = trans;
}

+ if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
+ tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
+ IEEE80211_TX_INTFL_MLME_CONN_TX;
+
ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
auth_data->data, auth_data->data_len,
auth_data->bss->bssid,
@@ -3242,12 +3242,12 @@ static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
* will not answer to direct packet in unassociated state.
*/
ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
- NULL, 0, (u32) -1, true, tx_flags,
+ NULL, 0, (u32) -1, true, 0,
auth_data->bss->channel, false);
rcu_read_unlock();
}

- if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
+ if (tx_flags == 0) {
auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
ifmgd->auth_data->timeout_started = true;
run_again(ifmgd, auth_data->timeout);
--
1.7.4.4

2013-05-17 12:02:04

by Johannes Berg

Subject: Re: [PATCH 3.10] mac80211: fix direct probe auth

On Fri, 2013-05-17 at 13:43 +0200, Stanislaw Gruszka wrote:
> We send direct probe to broadcast address, as some APs do not respond to
> unicast PROBE frames when unassociated. Broadcast frames are not acked,
> so we can not use that for trigger MLME state machine, but we need to
> use old timeout mechanism.

Makes sense, applied.

johannes