From: Nishant Sarmukadam <nishants@xxxxxxxxxxx>
Different tail pads will be needed for crypto depending on the crypto
mode. Add support to encapsulate the packets with appropriate pad
value.
V2:
- Remove unneeded fill_ccmp_header() and CCMP header data
structures (Johannes, Yogesh)
- Use new cipher definitions earlier in patchset (Johannes)
Signed-off-by: Nishant Sarmukadam <nishants@xxxxxxxxxxx>
Signed-off-by: Pradeep Nemavat <pnemavat@xxxxxxxxxxx>
Signed-off-by: Thomas Pedersen <thomas@xxxxxxxxxxx>
---
drivers/net/wireless/mwl8k.c | 54 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 53 insertions(+), 1 deletions(-)
diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 1798b7e..95bbdca 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -232,6 +232,9 @@ struct mwl8k_priv {
struct completion firmware_loading_complete;
};
+#define MAX_WEP_KEY_LEN 13
+#define NUM_WEP_KEYS 4
+
/* Per interface specific private data */
struct mwl8k_vif {
struct list_head list;
@@ -242,6 +245,12 @@ struct mwl8k_vif {
/* Non AMPDU sequence number assigned by driver. */
u16 seqno;
+
+ /* Saved WEP keys */
+ struct {
+ u8 enabled;
+ u8 key[sizeof(struct ieee80211_key_conf) + MAX_WEP_KEY_LEN];
+ } wep_key_conf[NUM_WEP_KEYS];
};
#define MWL8K_VIF(_vif) ((struct mwl8k_vif *)&((_vif)->drv_priv))
@@ -754,6 +763,49 @@ mwl8k_add_dma_header(struct sk_buff *skb, int tail_pad)
tr->fwlen = cpu_to_le16(skb->len - sizeof(*tr) + tail_pad);
}
+static void mwl8k_encapsulate_tx_frame(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *wh;
+ struct ieee80211_tx_info *tx_info;
+ struct ieee80211_key_conf *key_conf;
+ int data_pad;
+
+ wh = (struct ieee80211_hdr *)skb->data;
+
+ tx_info = IEEE80211_SKB_CB(skb);
+
+ key_conf = NULL;
+ if (ieee80211_is_data(wh->frame_control))
+ key_conf = tx_info->control.hw_key;
+
+ /*
+ * Make sure the packet header is in the DMA header format (4-address
+ * without QoS), the necessary crypto padding between the header and the
+ * payload has already been provided by mac80211, but it doesn't add tail
+ * padding when HW crypto is enabled.
+ *
+ * We have the following trailer padding requirements:
+ * - WEP: 4 trailer bytes (ICV)
+ * - TKIP: 12 trailer bytes (8 MIC + 4 ICV)
+ * - CCMP: 8 trailer bytes (MIC)
+ */
+ data_pad = 0;
+ if (key_conf != NULL) {
+ switch (key_conf->cipher) {
+ case WLAN_CIPHER_SUITE_WEP40:
+ case WLAN_CIPHER_SUITE_WEP104:
+ data_pad = 4;
+ break;
+ case WLAN_CIPHER_SUITE_TKIP:
+ data_pad = 12;
+ break;
+ case WLAN_CIPHER_SUITE_CCMP:
+ data_pad = 8;
+ break;
+ }
+ }
+ mwl8k_add_dma_header(skb, data_pad);
+}
/*
* Packet reception for 88w8366 AP firmware.
@@ -1447,7 +1499,7 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
else
qos = 0;
- mwl8k_add_dma_header(skb, 0);
+ mwl8k_encapsulate_tx_frame(skb);
wh = &((struct mwl8k_dma_data *)skb->data)->wh;
tx_info = IEEE80211_SKB_CB(skb);
--
1.7.0.4
--
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