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mac80211: move tx crypto decision 

This patch moves the decision making about whether a frame is encrypted
with a certain algorithm up into the TX handlers rather than having it
in the crypto algorithm implementation.

This fixes a problem with the radiotap injection code where injecting
a non-data packet and requesting encryption could end up asking the
driver to encrypt a packet without giving it a key.

Signed-off-by: Johannes Berg <johannes@sipsolutions.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 2007-12-18 15:27:47 +01:00 committed by David S. Miller
parent 7bbdd2d987
commit 176e4f8442
3 changed files with 22 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
net/mac80211/tx.c
View File

@ -438,11 +438,7 @@ static ieee80211_txrx_result
ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
{
struct ieee80211_key *key;
const struct ieee80211_hdr *hdr;
u16 fc;
hdr = (const struct ieee80211_hdr *) tx->skb->data;
fc = le16_to_cpu(hdr->frame_control);
u16 fc = tx->fc;
if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
tx->key = NULL;
@ -455,15 +451,33 @@ ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
!(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) {
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) {
u16 ftype, stype;
tx->key->tx_rx_count++;
/* TODO: add threshold stuff again */
switch (tx->key->conf.alg) {
case ALG_WEP:
ftype = fc & IEEE80211_FCTL_FTYPE;
stype = fc & IEEE80211_FCTL_STYPE;
if (ftype == IEEE80211_FTYPE_MGMT &&
stype == IEEE80211_STYPE_AUTH)
break;
case ALG_TKIP:
case ALG_CCMP:
if (!WLAN_FC_DATA_PRESENT(fc))
tx->key = NULL;
break;
}
}
if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
return TXRX_CONTINUE;
}
@ -706,15 +720,6 @@ 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;
}

10
net/mac80211/wep.c
View File

@ -349,16 +349,6 @@ static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
ieee80211_txrx_result
ieee80211_crypto_wep_encrypt(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
u16 fc;
fc = le16_to_cpu(hdr->frame_control);
if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
(fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
return TXRX_CONTINUE;
tx->u.tx.control->iv_len = WEP_IV_LEN;
tx->u.tx.control->icv_len = WEP_ICV_LEN;
ieee80211_tx_set_iswep(tx);

14
net/mac80211/wpa.c
View File

@ -245,16 +245,9 @@ static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
ieee80211_txrx_result
ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
u16 fc;
struct sk_buff *skb = tx->skb;
int wpa_test = 0, test = 0;
fc = le16_to_cpu(hdr->frame_control);
if (!WLAN_FC_DATA_PRESENT(fc))
return TXRX_CONTINUE;
tx->u.tx.control->icv_len = TKIP_ICV_LEN;
tx->u.tx.control->iv_len = TKIP_IV_LEN;
ieee80211_tx_set_iswep(tx);
@ -501,16 +494,9 @@ static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
ieee80211_txrx_result
ieee80211_crypto_ccmp_encrypt(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
u16 fc;
struct sk_buff *skb = tx->skb;
int test = 0;
fc = le16_to_cpu(hdr->frame_control);
if (!WLAN_FC_DATA_PRESENT(fc))
return TXRX_CONTINUE;
tx->u.tx.control->icv_len = CCMP_MIC_LEN;
tx->u.tx.control->iv_len = CCMP_HDR_LEN;
ieee80211_tx_set_iswep(tx);