mac80211: Get IV len from key conf and not cipher scheme
When a key is installed using a cipher scheme, set a new
internal key flag (KEY_FLAG_CIPHER_SCHEME) on it, to allow
distinguishing such keys more easily.
In particular, use this flag on the TX path instead of
testing the sta->cipher_scheme pointer, as the station is
NULL for broad-/multicast message, and use the key's iv_len
instead of the cipher scheme information.
Signed-off-by: Cedric Izoard <cedric.izoard@ceva-dsp.com>
[add missing documentation, rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 75de6fa..9d63d93 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -780,9 +780,8 @@
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_key *key = tx->key;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- const struct ieee80211_cipher_scheme *cs = key->sta->cipher_scheme;
int hdrlen;
- u8 *pos;
+ u8 *pos, iv_len = key->conf.iv_len;
if (info->control.hw_key &&
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
@@ -790,14 +789,14 @@
return TX_CONTINUE;
}
- if (unlikely(skb_headroom(skb) < cs->hdr_len &&
- pskb_expand_head(skb, cs->hdr_len, 0, GFP_ATOMIC)))
+ if (unlikely(skb_headroom(skb) < iv_len &&
+ pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
return TX_DROP;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
- pos = skb_push(skb, cs->hdr_len);
- memmove(pos, pos + cs->hdr_len, hdrlen);
+ pos = skb_push(skb, iv_len);
+ memmove(pos, pos + iv_len, hdrlen);
return TX_CONTINUE;
}
@@ -1217,7 +1216,7 @@
if (!info->control.hw_key)
return TX_DROP;
- if (tx->key->sta->cipher_scheme) {
+ if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
res = ieee80211_crypto_cs_encrypt(tx, skb);
if (res != TX_CONTINUE)
return res;