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[MAC80211]: remove HW_KEY_IDX_INVALID

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This patch makes the mac80211/driver interface rely only on the
IEEE80211_TXCTL_DO_NOT_ENCRYPT flag to signal to the driver whether
a frame should be encrypted or not, since mac80211 internally no
longer relies on HW_KEY_IDX_INVALID either this removes it, changes
the key index to be a u8 in all places and makes the full range of
the value available to drivers.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2007-09-14 11:10:25 -04:00 committed by David S. Miller
parent 7ac1bd6aec
commit 6a7664d451
3 changed files with 20 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/net/mac80211.h
View File

@ -164,7 +164,6 @@ struct ieee80211_low_level_stats {
/* Transmit control fields. This data structure is passed to low-level driver
* with each TX frame. The low-level driver is responsible for configuring
* the hardware to use given values (depending on what is supported). */
#define HW_KEY_IDX_INVALID -1
struct ieee80211_tx_control {
int tx_rate; /* Transmit rate, given as the hw specific value for the
@ -197,13 +196,13 @@ struct ieee80211_tx_control {
* long retry value */
u32 flags; /* tx control flags defined
* above */
u8 key_idx; /* keyidx from hw->set_key(), undefined if
* IEEE80211_TXCTL_DO_NOT_ENCRYPT is set */
u8 retry_limit; /* 1 = only first attempt, 2 = one retry, ..
* This could be used when set_retry_limit
* is not implemented by the driver */
u8 power_level; /* per-packet transmit power level, in dBm */
u8 antenna_sel_tx; /* 0 = default/diversity, 1 = Ant0, 2 = Ant1 */
s8 key_idx; /* HW_KEY_IDX_INVALID = do not encrypt,
* other values: keyidx from hw->set_key() */
u8 icv_len; /* length of the ICV/MIC field in octets */
u8 iv_len; /* length of the IV field in octets */
u8 tkip_key[16]; /* generated phase2/phase1 key for hw TKIP */
@ -467,8 +466,7 @@ enum ieee80211_key_flags {
*
* @hw_key_idx: To be set by the driver, this is the key index the driver
* wants to be given when a frame is transmitted and needs to be
* encrypted in hardware. It defaults to %HW_KEY_IDX_INVALID which
* the driver may not use.
* encrypted in hardware.
* @alg: The key algorithm.
* @flags: key flags, see &enum ieee80211_key_flags.
* @keyidx: the key index (0-3)
@ -476,8 +474,8 @@ enum ieee80211_key_flags {
* @key: key material
*/
struct ieee80211_key_conf {
int hw_key_idx;
ieee80211_key_alg alg;
u8 hw_key_idx;
u8 flags;
s8 keyidx;
u8 keylen;
@ -686,9 +684,10 @@ struct ieee80211_ops {
* selected by the low-level driver.
*
* Return 0 if the key is now in use, -EOPNOTSUPP or -ENOSPC if it
* couldn't be added; if you return 0 then hw_key_idx must be
* assigned to something other than HW_KEY_IDX_INVALID. When the cmd
* is DISABLE_KEY then it must succeed.
* couldn't be added; if you return 0 then hw_key_idx must be assigned
* to the hardware key index, you are free to use the full u8 range.
*
* When the cmd is DISABLE_KEY then it must succeed.
*
* Note that it is permissible to not decrypt a frame even if a key
* for it has been uploaded to hardware, the stack will not make any

4
net/mac80211/key.c
View File

@ -73,8 +73,6 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
key->sdata->dev->dev_addr, addr,
&key->conf);
WARN_ON(!ret && (key->conf.hw_key_idx == HW_KEY_IDX_INVALID));
if (!ret)
key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
@ -109,7 +107,6 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
key->conf.keyidx, MAC_ARG(addr), ret);
key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
key->conf.hw_key_idx = HW_KEY_IDX_INVALID;
}
struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
@ -132,7 +129,6 @@ struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
* Default to software encryption; we'll later upload the
* key to the hardware if possible.
*/
key->conf.hw_key_idx = HW_KEY_IDX_INVALID;
key->conf.flags = 0;
key->flags = 0;

16
net/mac80211/tx.c
View File

@ -430,8 +430,6 @@ ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
{
struct ieee80211_key *key;
tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
tx->key = NULL;
else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
@ -442,8 +440,10 @@ ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
!(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
return TXRX_DROP;
} else
} else {
tx->key = NULL;
tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
}
if (tx->key) {
tx->key->tx_rx_count++;
@ -724,6 +724,15 @@ ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
}
}
/*
* Tell hardware to not encrypt when we had sw crypto.
* Because we use the same flag to internally indicate that
* no (software) encryption should be done, we have to set it
* after all crypto handlers.
*/
if (tx->key && !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
return TXRX_CONTINUE;
}
@ -833,7 +842,6 @@ __ieee80211_parse_tx_radiotap(
*/
control->retry_limit = 1; /* no retry */
control->key_idx = HW_KEY_IDX_INVALID;
control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
IEEE80211_TXCTL_USE_CTS_PROTECT);
control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |