linux-kernel - [PATCH] staging:r8188eu: Use lib80211 to encrypt (WEP) tx frames

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Message-Id: <20180528061821.26948-1-insafonov@gmail.com>
Date:   Mon, 28 May 2018 09:18:21 +0300
From:   Ivan Safonov <insafonov@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Santha Meena Ramamoorthy <santhameena13@...il.com>,
        Janani Sankara Babu <jananis37@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Ivan Safonov <insafonov@...il.com>
Subject: [PATCH] staging:r8188eu: Use lib80211 to encrypt (WEP) tx frames

Put data to skb, decrypt with lib80211_crypt_wep, and place back to tx buffer.

Signed-off-by: Ivan Safonov <insafonov@...il.com>
---
 drivers/staging/rtl8188eu/core/rtw_security.c | 72 ++++++++++++++++-----------
 1 file changed, 43 insertions(+), 29 deletions(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_security.c b/drivers/staging/rtl8188eu/core/rtw_security.c
index bfe0b217e679..80d7569a3108 100644
--- a/drivers/staging/rtl8188eu/core/rtw_security.c
+++ b/drivers/staging/rtl8188eu/core/rtw_security.c
@@ -139,17 +139,11 @@ static __le32 getcrc32(u8 *buf, int len)
 	Need to consider the fragment  situation
 */
 void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe)
-{	/*  exclude ICV */
-
-	unsigned char	crc[4];
-	struct arc4context	 mycontext;
-
+{
 	int	curfragnum, length;
-	u32	keylength;
 
-	u8	*pframe, *payload, *iv;    /* wepkey */
-	u8	wepkey[16];
-	u8   hw_hdr_offset = 0;
+	u8 *pframe;
+	u8 hw_hdr_offset = 0;
 	struct	pkt_attrib	 *pattrib = &((struct xmit_frame *)pxmitframe)->attrib;
 	struct	security_priv	*psecuritypriv = &padapter->securitypriv;
 	struct	xmit_priv		*pxmitpriv = &padapter->xmitpriv;
@@ -165,33 +159,53 @@ void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe)
 
 	/* start to encrypt each fragment */
 	if ((pattrib->encrypt == _WEP40_) || (pattrib->encrypt == _WEP104_)) {
-		keylength = psecuritypriv->dot11DefKeylen[psecuritypriv->dot11PrivacyKeyIndex];
+		const int keyindex = psecuritypriv->dot11PrivacyKeyIndex;
+		void *crypto_private;
+		struct sk_buff *skb;
+		struct lib80211_crypto_ops *crypto_ops = try_then_request_module(lib80211_get_crypto_ops("WEP"), "lib80211_crypt_wep");
+
+		if (!crypto_ops)
+			goto exit;
+
+		crypto_private = crypto_ops->init(keyindex);
+		if (!crypto_private)
+			goto exit;
+
+		if (crypto_ops->set_key(psecuritypriv->dot11DefKey[keyindex].skey,
+					psecuritypriv->dot11DefKeylen[keyindex], NULL, crypto_private) < 0)
+			goto exit;
 
 		for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
-			iv = pframe+pattrib->hdrlen;
-			memcpy(&wepkey[0], iv, 3);
-			memcpy(&wepkey[3], &psecuritypriv->dot11DefKey[psecuritypriv->dot11PrivacyKeyIndex].skey[0], keylength);
-			payload = pframe+pattrib->iv_len+pattrib->hdrlen;
+			if (curfragnum + 1 == pattrib->nr_frags)
+				length = pattrib->last_txcmdsz;
+			else
+				length = pxmitpriv->frag_len;
+			skb = dev_alloc_skb(length);
+			if (!skb)
+				goto exit;
 
-			if ((curfragnum+1) == pattrib->nr_frags) {	/* the last fragment */
-				length = pattrib->last_txcmdsz-pattrib->hdrlen-pattrib->iv_len-pattrib->icv_len;
+			skb_put_data(skb, pframe, length);
 
-				*((__le32 *)crc) = getcrc32(payload, length);
+			memmove(skb->data + 4, skb->data, pattrib->hdrlen);
+			skb_pull(skb, 4);
+			skb_trim(skb, skb->len - 4);
 
-				arcfour_init(&mycontext, wepkey, 3+keylength);
-				arcfour_encrypt(&mycontext, payload, payload, length);
-				arcfour_encrypt(&mycontext, payload+length, crc, 4);
-			} else {
-				length = pxmitpriv->frag_len-pattrib->hdrlen-pattrib->iv_len-pattrib->icv_len;
-				*((__le32 *)crc) = getcrc32(payload, length);
-				arcfour_init(&mycontext, wepkey, 3+keylength);
-				arcfour_encrypt(&mycontext, payload, payload, length);
-				arcfour_encrypt(&mycontext, payload+length, crc, 4);
-
-				pframe += pxmitpriv->frag_len;
-				pframe = (u8 *)round_up((size_t)(pframe), 4);
+			if (crypto_ops->encrypt_mpdu(skb, pattrib->hdrlen, crypto_private)) {
+				kfree_skb(skb);
+				goto exit;
 			}
+
+			memcpy(pframe, skb->data, skb->len);
+
+			pframe += skb->len;
+			pframe = (u8 *)round_up((size_t)(pframe), 4);
+
+			kfree_skb(skb);
 		}
+
+exit:
+		if (crypto_ops && crypto_private)
+			crypto_ops->deinit(crypto_private);
 	}
 
 }
-- 
2.16.1