path: root/drivers/net/wireless/iwlwifi
diff options
authorJohannes Berg <>2011-07-07 22:28:01 +0200
committerJohn W. Linville <>2011-07-08 11:11:19 -0400
commit523b02ea23b175dd3e46e3daf1bc9354376640a3 (patch)
treea11f69f05cdfb457a42b2866e33e73937c35ec1e /drivers/net/wireless/iwlwifi
parent397915c30731340ee3f348d1be597b22467acbdf (diff)
mac80211: fix TKIP races, make API easier to use
Our current TKIP code races against itself on TX since we can process multiple packets at the same time on different ACs, but they all share the TX context for TKIP. This can lead to bad IVs etc. Also, the crypto offload helper code just obtains the P1K/P2K from the cache, and can update it as well, but there's no guarantee that packets are really processed in order. To fix these issues, first introduce a spinlock that will protect the IV16/IV32 values in the TX context. This first step makes sure that we don't assign the same IV multiple times or get confused in other ways. Secondly, change the way the P1K cache works. I add a field "p1k_iv32" that stores the value of the IV32 when the P1K was last recomputed, and if different from the last time, then a new P1K is recomputed. This can cause the P1K computation to flip back and forth if packets are processed out of order. All this also happens under the new spinlock. Finally, because there are argument differences, split up the ieee80211_get_tkip_key() API into ieee80211_get_tkip_p1k() and ieee80211_get_tkip_p2k() and give them the correct arguments. Signed-off-by: Johannes Berg <> Signed-off-by: John W. Linville <>
Diffstat (limited to 'drivers/net/wireless/iwlwifi')
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index c05a8d9fbd2e..a87e95728b1d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -497,8 +497,7 @@ static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
- ieee80211_get_tkip_key(keyconf, skb_frag,
- IEEE80211_TKIP_P2_KEY, tx_cmd->key);
+ ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");