[PATCH v5 05/15] staging: rtl8723au: Reorganize a few functions to remove indentation

[M. Vefa Bicakci]

Prior to this commit, functions rtw_tkip_encrypt23a and rtw_tkip_decrypt23a had
large if blocks which contained the majority of the logic in the functions.

Rework these functions so that if the negated version of the aforementioned if
blocks' conditions are true, we return from the function with _FAIL, as
expected by the calling code.

This lets us remove two levels of indentation from the functions in
question, making them more readable.

Signed-off-by: M. Vefa Bicakci <m.v.b@xxxxxxxxxx>

---

v5: Move the "start to encrypt each fragment" and "start to decrypt
    recvframe" comments in the refactored functions to more sensible
    positions.
---
 drivers/staging/rtl8723au/core/rtw_security.c | 215 +++++++++++++-------------
 1 file changed, 107 insertions(+), 108 deletions(-)

diff --git a/drivers/staging/rtl8723au/core/rtw_security.c b/drivers/staging/rtl8723au/core/rtw_security.c
index 3e79b66d0897..df7261c045fe 100644
--- a/drivers/staging/rtl8723au/core/rtw_security.c
+++ b/drivers/staging/rtl8723au/core/rtw_security.c
@@ -615,91 +615,90 @@ int rtw_tkip_encrypt23a(struct rtw_adapter *padapter,
 	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 	int res = _SUCCESS;
 
+	if (pattrib->encrypt != WLAN_CIPHER_SUITE_TKIP)
+		return _FAIL;
+
 	if (!pxmitframe->buf_addr)
 		return _FAIL;
 
 	hw_hdr_offset = TXDESC_OFFSET;
 
 	pframe = pxmitframe->buf_addr + hw_hdr_offset;
-	/* 4 start to encrypt each fragment */
-	if (pattrib->encrypt == WLAN_CIPHER_SUITE_TKIP) {
-		if (pattrib->psta)
-			stainfo = pattrib->psta;
-		else {
-			DBG_8723A("%s, call rtw_get_stainfo()\n", __func__);
-			stainfo = rtw_get_stainfo23a(&padapter->stapriv,
-						     &pattrib->ra[0]);
-		}
 
-		if (stainfo != NULL) {
+	if (pattrib->psta)
+		stainfo = pattrib->psta;
+	else {
+		DBG_8723A("%s, call rtw_get_stainfo()\n", __func__);
+		stainfo = rtw_get_stainfo23a(&padapter->stapriv,
+					     &pattrib->ra[0]);
+	}
 
-			if (!(stainfo->state & _FW_LINKED)) {
-				DBG_8723A("%s, psta->state(0x%x) != _FW_LINKED\n", __func__, stainfo->state);
-				return _FAIL;
-			}
+	if (stainfo == NULL) {
+		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
+			 "rtw_tkip_encrypt23a: stainfo == NULL!!!\n");
+		DBG_8723A("%s, psta == NUL\n", __func__);
+		return _FAIL;
+	}
 
-			RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
-				 "rtw_tkip_encrypt23a: stainfo!= NULL!!!\n");
+	RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
+		 "rtw_tkip_encrypt23a: stainfo!= NULL!!!\n");
 
-			if (is_multicast_ether_addr(pattrib->ra))
-				prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
-			else
-				prwskey = &stainfo->dot118021x_UncstKey.skey[0];
+	if (!(stainfo->state & _FW_LINKED)) {
+		DBG_8723A("%s, psta->state(0x%x) != _FW_LINKED\n", __func__, stainfo->state);
+		return _FAIL;
+	}
 
-			prwskeylen = 16;
+	if (is_multicast_ether_addr(pattrib->ra))
+		prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
+	else
+		prwskey = &stainfo->dot118021x_UncstKey.skey[0];
 
-			for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
-				iv = pframe + pattrib->hdrlen;
-				payload = pframe + pattrib->iv_len + pattrib->hdrlen;
+	prwskeylen = 16;
 
-				GET_TKIP_PN(iv, dot11txpn);
+	/* 4 start to encrypt each fragment */
+	for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
+		iv = pframe + pattrib->hdrlen;
+		payload = pframe + pattrib->iv_len + pattrib->hdrlen;
 
-				pnl = (u16)(dot11txpn.val);
-				pnh = (u32)(dot11txpn.val>>16);
+		GET_TKIP_PN(iv, dot11txpn);
 
-				phase1((u16 *)&ttkey[0], prwskey, &pattrib->ta[0], pnh);
+		pnl = (u16)(dot11txpn.val);
+		pnh = (u32)(dot11txpn.val>>16);
 
-				phase2(&rc4key[0], prwskey, (u16 *)&ttkey[0], pnl);
+		phase1((u16 *)&ttkey[0], prwskey, &pattrib->ta[0], pnh);
 
-				if ((curfragnum + 1) == pattrib->nr_frags) {	/* 4 the last fragment */
-					length = (pattrib->last_txcmdsz -
-						  pattrib->hdrlen -
-						  pattrib->iv_len -
-						  pattrib->icv_len);
+		phase2(&rc4key[0], prwskey, (u16 *)&ttkey[0], pnl);
 
-					RT_TRACE(_module_rtl871x_security_c_, _drv_info_,
-						 "pattrib->iv_len =%x, pattrib->icv_len =%x\n",
-						 pattrib->iv_len,
-						 pattrib->icv_len);
-					*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
+		if ((curfragnum + 1) == pattrib->nr_frags) {	/* 4 the last fragment */
+			length = (pattrib->last_txcmdsz -
+				  pattrib->hdrlen -
+				  pattrib->iv_len -
+				  pattrib->icv_len);
 
-					arcfour_init(&mycontext, rc4key, 16);
-					arcfour_encrypt(&mycontext, payload, payload, length);
-					arcfour_encrypt(&mycontext, payload + length, crc, 4);
+			RT_TRACE(_module_rtl871x_security_c_, _drv_info_,
+				 "pattrib->iv_len =%x, pattrib->icv_len =%x\n",
+				 pattrib->iv_len,
+				 pattrib->icv_len);
+			*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
 
-				} else {
-					length = (pxmitpriv->frag_len -
-						  pattrib->hdrlen -
-						  pattrib->iv_len -
-						  pattrib->icv_len);
+			arcfour_init(&mycontext, rc4key, 16);
+			arcfour_encrypt(&mycontext, payload, payload, length);
+			arcfour_encrypt(&mycontext, payload + length, crc, 4);
 
-					*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
-					arcfour_init(&mycontext, rc4key, 16);
-					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);
 
-					pframe += pxmitpriv->frag_len;
-					pframe  = PTR_ALIGN(pframe, 4);
-				}
-			}
+			*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
+			arcfour_init(&mycontext, rc4key, 16);
+			arcfour_encrypt(&mycontext, payload, payload, length);
+			arcfour_encrypt(&mycontext, payload + length, crc, 4);
 
-		} else {
-			RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
-				 "rtw_tkip_encrypt23a: stainfo == NULL!!!\n");
-			DBG_8723A("%s, psta == NUL\n", __func__);
-			res = _FAIL;
+			pframe += pxmitpriv->frag_len;
+			pframe  = PTR_ALIGN(pframe, 4);
 		}
-
 	}
 
 	return res;
@@ -725,64 +724,64 @@ int rtw_tkip_decrypt23a(struct rtw_adapter *padapter,
 	struct sk_buff *skb = precvframe->pkt;
 	int res = _SUCCESS;
 
+	if (prxattrib->encrypt != WLAN_CIPHER_SUITE_TKIP)
+		return _FAIL;
+
 	pframe = skb->data;
 
+	stainfo = rtw_get_stainfo23a(&padapter->stapriv,
+				     &prxattrib->ta[0]);
+	if (stainfo == NULL) {
+		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
+			 "rtw_tkip_decrypt23a: stainfo == NULL!!!\n");
+		return _FAIL;
+	}
+
 	/* 4 start to decrypt recvframe */
-	if (prxattrib->encrypt == WLAN_CIPHER_SUITE_TKIP) {
+	if (is_multicast_ether_addr(prxattrib->ra)) {
+		if (psecuritypriv->binstallGrpkey == 0) {
+			res = _FAIL;
+			DBG_8723A("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
+			goto exit;
+		}
+		prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
+		prwskeylen = 16;
+	} else {
+		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
+			 "rtw_tkip_decrypt23a: stainfo!= NULL!!!\n");
+		prwskey = &stainfo->dot118021x_UncstKey.skey[0];
+		prwskeylen = 16;
+	}
 
-		stainfo = rtw_get_stainfo23a(&padapter->stapriv,
-					     &prxattrib->ta[0]);
-		if (stainfo != NULL) {
-
-			if (is_multicast_ether_addr(prxattrib->ra)) {
-				if (psecuritypriv->binstallGrpkey == 0) {
-					res = _FAIL;
-					DBG_8723A("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
-					goto exit;
-				}
-				prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
-				prwskeylen = 16;
-			} else {
-				RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
-					 "rtw_tkip_decrypt23a: stainfo!= NULL!!!\n");
-				prwskey = &stainfo->dot118021x_UncstKey.skey[0];
-				prwskeylen = 16;
-			}
+	iv = pframe + prxattrib->hdrlen;
+	payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
+	length = skb->len - prxattrib->hdrlen - prxattrib->iv_len;
 
-			iv = pframe + prxattrib->hdrlen;
-			payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
-			length = skb->len - prxattrib->hdrlen - prxattrib->iv_len;
+	GET_TKIP_PN(iv, dot11txpn);
 
-			GET_TKIP_PN(iv, dot11txpn);
+	pnl = (u16)(dot11txpn.val);
+	pnh = (u32)(dot11txpn.val>>16);
 
-			pnl = (u16)(dot11txpn.val);
-			pnh = (u32)(dot11txpn.val>>16);
+	phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
+	phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);
 
-			phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
-			phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);
+	/* 4 decrypt payload include icv */
+	arcfour_init(&mycontext, rc4key, 16);
+	arcfour_encrypt(&mycontext, payload, payload, length);
 
-			/* 4 decrypt payload include icv */
-			arcfour_init(&mycontext, rc4key, 16);
-			arcfour_encrypt(&mycontext, payload, payload, length);
+	*((u32 *)crc) = le32_to_cpu(getcrc32(payload, length - 4));
 
-			*((u32 *)crc) = le32_to_cpu(getcrc32(payload, length - 4));
-
-			if (crc[3] != payload[length - 1] || crc[2] != payload[length - 2] || crc[1] != payload[length - 3] || crc[0] != payload[length - 4])
-			{
-				RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
-					 "rtw_wep_decrypt23a:icv error crc[3](%x)!= payload[length-1](%x) || crc[2](%x)!= payload[length-2](%x) || crc[1](%x)!= payload[length-3](%x) || crc[0](%x)!= payload[length-4](%x)\n",
-					 crc[3], payload[length - 1],
-					 crc[2], payload[length - 2],
-					 crc[1], payload[length - 3],
-					 crc[0], payload[length - 4]);
-				res = _FAIL;
-			}
-		} else {
-			RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
-				 "rtw_tkip_decrypt23a: stainfo == NULL!!!\n");
-			res = _FAIL;
-		}
+	if (crc[3] != payload[length - 1] || crc[2] != payload[length - 2] || crc[1] != payload[length - 3] || crc[0] != payload[length - 4])
+	{
+		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
+			 "rtw_wep_decrypt23a:icv error crc[3](%x)!= payload[length-1](%x) || crc[2](%x)!= payload[length-2](%x) || crc[1](%x)!= payload[length-3](%x) || crc[0](%x)!= payload[length-4](%x)\n",
+			 crc[3], payload[length - 1],
+			 crc[2], payload[length - 2],
+			 crc[1], payload[length - 3],
+			 crc[0], payload[length - 4]);
+		res = _FAIL;
 	}
+
 exit:
 	return res;
 }
-- 
2.1.4

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