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authorArik Nemtsov <arik@wizery.com>2011-10-23 10:21:41 +0400
committerJohn W. Linville <linville@tuxdriver.com>2011-11-09 00:54:27 +0400
commit077a9154898b374f20555adc3f620cccd02581d6 (patch)
tree77549521a0633899874a2b7f694f240cd7e61414 /net/mac80211/wpa.c
parent3b7b72eed19684824806b3fbefef653a180ef2b0 (diff)
downloadlinux-077a9154898b374f20555adc3f620cccd02581d6.tar.xz
mac80211: support adding IV-room in the skb for CCMP keys
Some cards can generate CCMP IVs in HW, but require the space for the IV to be pre-allocated in the frame at the correct offset. Add a key flag that allows us to achieve this. Signed-off-by: Arik Nemtsov <arik@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/wpa.c')
-rw-r--r--net/mac80211/wpa.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index f614ce7bb6e3..13efab5bf12a 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -390,7 +390,8 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
u8 scratch[6 * AES_BLOCK_SIZE];
if (info->control.hw_key &&
- !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
+ !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
+ !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
/*
* hwaccel has no need for preallocated room for CCMP
* header or MIC fields
@@ -412,6 +413,11 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
pos = skb_push(skb, CCMP_HDR_LEN);
memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
+
+ /* the HW only needs room for the IV, but not the actual IV */
+ if (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)
+ return 0;
+
hdr = (struct ieee80211_hdr *) pos;
pos += hdrlen;