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mac80211: move control.hw_key assignment
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When mac80211 asks a driver to encrypt a frame, it
must assign the control.hw_key pointer for it to
know which key to use etc. Currently, mac80211 does
this whenever it would software-encrypt a frame.

Change the logic of this code to assign the hw_key
pointer when selecting the key, and later check it
when deciding whether to encrypt the frame or let
it be encrypted by the hardware. This allows us to
later simply skip the encryption function since it
no longer modifies the TX control.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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Johannes Berg authored and John W. Linville committed Jan 19, 2010
1 parent a6bae9e commit 813d766
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Showing 4 changed files with 46 additions and 49 deletions.
11 changes: 6 additions & 5 deletions net/mac80211/tkip.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -195,11 +195,13 @@ void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
}
EXPORT_SYMBOL(ieee80211_get_tkip_key);

/* Encrypt packet payload with TKIP using @key. @pos is a pointer to the
/*
* Encrypt packet payload with TKIP using @key. @pos is a pointer to the
* beginning of the buffer containing payload. This payload must include
* headroom of eight octets for IV and Ext. IV and taildroom of four octets
* for ICV. @payload_len is the length of payload (_not_ including extra
* headroom and tailroom). @ta is the transmitter addresses. */
* the IV/Ext.IV and space for (taildroom) four octets for ICV.
* @payload_len is the length of payload (_not_ including IV/ICV length).
* @ta is the transmitter addresses.
*/
void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
struct ieee80211_key *key,
u8 *pos, size_t payload_len, u8 *ta)
Expand All @@ -214,7 +216,6 @@ void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,

tkip_mixing_phase2(tk, ctx, ctx->iv16, rc4key);

pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
}

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9 changes: 9 additions & 0 deletions net/mac80211/tx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -529,6 +529,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
tx->key = NULL;

if (tx->key) {
bool skip_hw = false;

tx->key->tx_rx_count++;
/* TODO: add threshold stuff again */

Expand All @@ -545,12 +547,19 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
!ieee80211_use_mfp(hdr->frame_control, tx->sta,
tx->skb))
tx->key = NULL;
skip_hw = (tx->key->conf.flags &
IEEE80211_KEY_FLAG_SW_MGMT) &&
ieee80211_is_mgmt(hdr->frame_control);
break;
case ALG_AES_CMAC:
if (!ieee80211_is_mgmt(hdr->frame_control))
tx->key = NULL;
break;
}

if (!skip_hw &&
tx->key->conf.flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
info->control.hw_key = &tx->key->conf;
}

return TX_CONTINUE;
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18 changes: 9 additions & 9 deletions net/mac80211/wep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -305,20 +305,20 @@ static int wep_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
if (!info->control.hw_key) {
if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key,
tx->key->conf.keylen,
tx->key->conf.keyidx))
return -1;
} else {
info->control.hw_key = &tx->key->conf;
if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
if (!ieee80211_wep_add_iv(tx->local, skb,
tx->key->conf.keylen,
tx->key->conf.keyidx))
return -1;
}
}

if (info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
if (!ieee80211_wep_add_iv(tx->local, skb,
tx->key->conf.keylen,
tx->key->conf.keyidx))
return -1;
}

return 0;
}

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57 changes: 22 additions & 35 deletions net/mac80211/wpa.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,8 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
unsigned int hdrlen;
struct ieee80211_hdr *hdr;
struct sk_buff *skb = tx->skb;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
int authenticator;
int wpa_test = 0;
int tail;

hdr = (struct ieee80211_hdr *)skb->data;
Expand All @@ -47,16 +47,15 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
data = skb->data + hdrlen;
data_len = skb->len - hdrlen;

if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
if (info->control.hw_key &&
!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
!wpa_test) {
/* hwaccel - with no need for preallocated room for MMIC */
!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
/* hwaccel - with no need for SW-generated MMIC */
return TX_CONTINUE;
}

tail = MICHAEL_MIC_LEN;
if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
if (!info->control.hw_key)
tail += TKIP_ICV_LEN;

if (WARN_ON(skb_tailroom(skb) < tail ||
Expand Down Expand Up @@ -147,17 +146,16 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
int len, tail;
u8 *pos;

if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
/* hwaccel - with no need for preallocated room for IV/ICV */
info->control.hw_key = &tx->key->conf;
if (info->control.hw_key &&
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
/* hwaccel - with no need for software-generated IV */
return 0;
}

hdrlen = ieee80211_hdrlen(hdr->frame_control);
len = skb->len - hdrlen;

if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
if (info->control.hw_key)
tail = 0;
else
tail = TKIP_ICV_LEN;
Expand All @@ -175,13 +173,11 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
if (key->u.tkip.tx.iv16 == 0)
key->u.tkip.tx.iv32++;

if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
/* hwaccel - with preallocated room for IV */
ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);

info->control.hw_key = &tx->key->conf;
/* hwaccel - with software IV */
if (info->control.hw_key)
return 0;
}

/* Add room for ICV */
skb_put(skb, TKIP_ICV_LEN);
Expand Down Expand Up @@ -363,24 +359,20 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
int hdrlen, len, tail;
u8 *pos, *pn;
int i;
bool skip_hw;

skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
ieee80211_is_mgmt(hdr->frame_control);

if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
!skip_hw) {
/* hwaccel - with no need for preallocated room for CCMP
* header or MIC fields */
info->control.hw_key = &tx->key->conf;
if (info->control.hw_key &&
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
/*
* hwaccel has no need for preallocated room for CCMP
* header or MIC fields
*/
return 0;
}

hdrlen = ieee80211_hdrlen(hdr->frame_control);
len = skb->len - hdrlen;

if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
if (info->control.hw_key)
tail = 0;
else
tail = CCMP_MIC_LEN;
Expand All @@ -405,11 +397,9 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)

ccmp_pn2hdr(pos, pn, key->conf.keyidx);

if ((key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && !skip_hw) {
/* hwaccel - with preallocated room for CCMP header */
info->control.hw_key = &tx->key->conf;
/* hwaccel - with software CCMP header */
if (info->control.hw_key)
return 0;
}

pos += CCMP_HDR_LEN;
ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
Expand Down Expand Up @@ -525,11 +515,8 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
u8 *pn, aad[20];
int i;

if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
/* hwaccel */
info->control.hw_key = &tx->key->conf;
if (info->control.hw_key)
return 0;
}

if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
return TX_DROP;
Expand Down

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