diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2011-07-07 22:28:01 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-07-08 11:11:19 -0400 |
| commit | 523b02ea23b175dd3e46e3daf1bc9354376640a3 (patch) | |
| tree | a11f69f05cdfb457a42b2866e33e73937c35ec1e /drivers/net | |
| parent | 397915c30731340ee3f348d1be597b22467acbdf (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 <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/wireless/b43/xmit.c | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/iwlegacy/iwl-4965-tx.c | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-agn-tx.c | 3 |
3 files changed, 3 insertions, 6 deletions
diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c index 488b898418a3..82bcf7595139 100644 --- a/drivers/net/wireless/b43/xmit.c +++ b/drivers/net/wireless/b43/xmit.c @@ -323,8 +323,7 @@ int b43_generate_txhdr(struct b43_wldev *dev, /* we give the phase1key and iv16 here, the key is stored in * shm. With that the hardware can do phase 2 and encryption. */ - ieee80211_get_tkip_key(info->control.hw_key, skb_frag, - IEEE80211_TKIP_P1_KEY, (u8*)phase1key); + ieee80211_get_tkip_p1k(info->control.hw_key, skb_frag, phase1key); /* phase1key is in host endian. Copy to little-endian txhdr->iv. */ for (i = 0; i < 5; i++) { txhdr->iv[i * 2 + 0] = phase1key[i]; diff --git a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c index 79ac081832fb..ac4f64de1363 100644 --- a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c +++ b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c @@ -240,8 +240,7 @@ static void iwl4965_tx_cmd_build_hwcrypto(struct iwl_priv *priv, case WLAN_CIPHER_SUITE_TKIP: 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"); break; 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, case WLAN_CIPHER_SUITE_TKIP: 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"); break; |