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@xxxxxxxxxxxxxxxx>
---
Also, that will make implementing 802.11w more straight-forward.
net/mac80211/tx.c | 39 ++++++++++++++++++++++-----------------
net/mac80211/wep.c | 10 ----------
net/mac80211/wpa.c | 14 --------------
3 files changed, 22 insertions(+), 41 deletions(-)
--- everything.orig/net/mac80211/tx.c 2007-12-18 14:36:17.243016004 +0100
+++ everything/net/mac80211/tx.c 2007-12-18 14:48:45.853013509 +0100
@@ -436,11 +436,7 @@ 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;
@@ -453,16 +449,34 @@ ieee80211_tx_h_select_key(struct ieee802
ieee80211_is_eapol(tx->skb, ieee80211_get_hdrlen(fc)))) {
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;
}
@@ -708,15 +722,6 @@ ieee80211_tx_h_misc(struct ieee80211_txr
}
}
- /*
- * 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;
}
--- everything.orig/net/mac80211/wep.c 2007-12-18 14:36:17.263016276 +0100
+++ everything/net/mac80211/wep.c 2007-12-18 14:48:45.863017306 +0100
@@ -349,16 +349,6 @@ static int wep_encrypt_skb(struct ieee80
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);
--- everything.orig/net/mac80211/wpa.c 2007-12-18 14:36:17.303016601 +0100
+++ everything/net/mac80211/wpa.c 2007-12-18 14:48:45.863017306 +0100
@@ -245,16 +245,9 @@ static int tkip_encrypt_skb(struct ieee8
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 ieee8
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);
-
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