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staging: rtl8723au: Reorganize a few functions to remove indentation
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@runbox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
M. Vefa Bicakci
Greg Kroah-Hartman
parent
a239023958
commit
c3cc7593ec
@ -615,91 +615,90 @@ int rtw_tkip_encrypt23a(struct rtw_adapter *padapter,
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struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
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int res = _SUCCESS;
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if (pattrib->encrypt != WLAN_CIPHER_SUITE_TKIP)
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return _FAIL;
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if (!pxmitframe->buf_addr)
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return _FAIL;
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hw_hdr_offset = TXDESC_OFFSET;
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pframe = pxmitframe->buf_addr + hw_hdr_offset;
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if (pattrib->psta)
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stainfo = pattrib->psta;
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else {
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DBG_8723A("%s, call rtw_get_stainfo()\n", __func__);
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stainfo = rtw_get_stainfo23a(&padapter->stapriv,
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&pattrib->ra[0]);
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}
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if (stainfo == NULL) {
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_encrypt23a: stainfo == NULL!!!\n");
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DBG_8723A("%s, psta == NUL\n", __func__);
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return _FAIL;
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}
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_encrypt23a: stainfo!= NULL!!!\n");
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if (!(stainfo->state & _FW_LINKED)) {
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DBG_8723A("%s, psta->state(0x%x) != _FW_LINKED\n", __func__, stainfo->state);
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return _FAIL;
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}
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if (is_multicast_ether_addr(pattrib->ra))
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prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
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else
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prwskey = &stainfo->dot118021x_UncstKey.skey[0];
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prwskeylen = 16;
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/* 4 start to encrypt each fragment */
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if (pattrib->encrypt == WLAN_CIPHER_SUITE_TKIP) {
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if (pattrib->psta)
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stainfo = pattrib->psta;
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else {
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DBG_8723A("%s, call rtw_get_stainfo()\n", __func__);
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stainfo = rtw_get_stainfo23a(&padapter->stapriv,
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&pattrib->ra[0]);
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}
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for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
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iv = pframe + pattrib->hdrlen;
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payload = pframe + pattrib->iv_len + pattrib->hdrlen;
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if (stainfo != NULL) {
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GET_TKIP_PN(iv, dot11txpn);
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if (!(stainfo->state & _FW_LINKED)) {
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DBG_8723A("%s, psta->state(0x%x) != _FW_LINKED\n", __func__, stainfo->state);
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return _FAIL;
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}
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pnl = (u16)(dot11txpn.val);
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pnh = (u32)(dot11txpn.val>>16);
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_encrypt23a: stainfo!= NULL!!!\n");
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phase1((u16 *)&ttkey[0], prwskey, &pattrib->ta[0], pnh);
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if (is_multicast_ether_addr(pattrib->ra))
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prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
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else
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prwskey = &stainfo->dot118021x_UncstKey.skey[0];
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phase2(&rc4key[0], prwskey, (u16 *)&ttkey[0], pnl);
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prwskeylen = 16;
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if ((curfragnum + 1) == pattrib->nr_frags) { /* 4 the last fragment */
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length = (pattrib->last_txcmdsz -
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pattrib->hdrlen -
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pattrib->iv_len -
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pattrib->icv_len);
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for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
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iv = pframe + pattrib->hdrlen;
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payload = pframe + pattrib->iv_len + pattrib->hdrlen;
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RT_TRACE(_module_rtl871x_security_c_, _drv_info_,
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"pattrib->iv_len =%x, pattrib->icv_len =%x\n",
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pattrib->iv_len,
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pattrib->icv_len);
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*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
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GET_TKIP_PN(iv, dot11txpn);
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pnl = (u16)(dot11txpn.val);
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pnh = (u32)(dot11txpn.val>>16);
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phase1((u16 *)&ttkey[0], prwskey, &pattrib->ta[0], pnh);
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phase2(&rc4key[0], prwskey, (u16 *)&ttkey[0], pnl);
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if ((curfragnum + 1) == pattrib->nr_frags) { /* 4 the last fragment */
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length = (pattrib->last_txcmdsz -
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pattrib->hdrlen -
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pattrib->iv_len -
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pattrib->icv_len);
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RT_TRACE(_module_rtl871x_security_c_, _drv_info_,
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"pattrib->iv_len =%x, pattrib->icv_len =%x\n",
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pattrib->iv_len,
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pattrib->icv_len);
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*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
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arcfour_init(&mycontext, rc4key, 16);
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arcfour_encrypt(&mycontext, payload, payload, length);
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arcfour_encrypt(&mycontext, payload + length, crc, 4);
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} else {
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length = (pxmitpriv->frag_len -
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pattrib->hdrlen -
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pattrib->iv_len -
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pattrib->icv_len);
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*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
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arcfour_init(&mycontext, rc4key, 16);
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arcfour_encrypt(&mycontext, payload, payload, length);
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arcfour_encrypt(&mycontext, payload + length, crc, 4);
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pframe += pxmitpriv->frag_len;
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pframe = PTR_ALIGN(pframe, 4);
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}
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}
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arcfour_init(&mycontext, rc4key, 16);
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arcfour_encrypt(&mycontext, payload, payload, length);
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arcfour_encrypt(&mycontext, payload + length, crc, 4);
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} else {
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_encrypt23a: stainfo == NULL!!!\n");
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DBG_8723A("%s, psta == NUL\n", __func__);
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res = _FAIL;
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}
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length = (pxmitpriv->frag_len -
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pattrib->hdrlen -
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pattrib->iv_len -
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pattrib->icv_len);
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*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));/* modified by Amy*/
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arcfour_init(&mycontext, rc4key, 16);
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arcfour_encrypt(&mycontext, payload, payload, length);
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arcfour_encrypt(&mycontext, payload + length, crc, 4);
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pframe += pxmitpriv->frag_len;
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pframe = PTR_ALIGN(pframe, 4);
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}
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}
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return res;
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@ -725,64 +724,64 @@ int rtw_tkip_decrypt23a(struct rtw_adapter *padapter,
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struct sk_buff *skb = precvframe->pkt;
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int res = _SUCCESS;
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if (prxattrib->encrypt != WLAN_CIPHER_SUITE_TKIP)
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return _FAIL;
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pframe = skb->data;
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/* 4 start to decrypt recvframe */
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if (prxattrib->encrypt == WLAN_CIPHER_SUITE_TKIP) {
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stainfo = rtw_get_stainfo23a(&padapter->stapriv,
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&prxattrib->ta[0]);
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if (stainfo != NULL) {
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if (is_multicast_ether_addr(prxattrib->ra)) {
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if (psecuritypriv->binstallGrpkey == 0) {
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res = _FAIL;
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DBG_8723A("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
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goto exit;
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}
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prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
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prwskeylen = 16;
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} else {
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_decrypt23a: stainfo!= NULL!!!\n");
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prwskey = &stainfo->dot118021x_UncstKey.skey[0];
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prwskeylen = 16;
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}
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iv = pframe + prxattrib->hdrlen;
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payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
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length = skb->len - prxattrib->hdrlen - prxattrib->iv_len;
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GET_TKIP_PN(iv, dot11txpn);
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pnl = (u16)(dot11txpn.val);
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pnh = (u32)(dot11txpn.val>>16);
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phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
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phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);
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/* 4 decrypt payload include icv */
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arcfour_init(&mycontext, rc4key, 16);
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arcfour_encrypt(&mycontext, payload, payload, length);
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*((u32 *)crc) = le32_to_cpu(getcrc32(payload, length - 4));
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if (crc[3] != payload[length - 1] || crc[2] != payload[length - 2] || crc[1] != payload[length - 3] || crc[0] != payload[length - 4])
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{
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"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",
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crc[3], payload[length - 1],
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crc[2], payload[length - 2],
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crc[1], payload[length - 3],
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crc[0], payload[length - 4]);
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res = _FAIL;
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}
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} else {
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_decrypt23a: stainfo == NULL!!!\n");
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res = _FAIL;
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}
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stainfo = rtw_get_stainfo23a(&padapter->stapriv,
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&prxattrib->ta[0]);
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if (stainfo == NULL) {
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_decrypt23a: stainfo == NULL!!!\n");
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return _FAIL;
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}
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/* 4 start to decrypt recvframe */
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if (is_multicast_ether_addr(prxattrib->ra)) {
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if (psecuritypriv->binstallGrpkey == 0) {
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res = _FAIL;
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DBG_8723A("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
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goto exit;
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}
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prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
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prwskeylen = 16;
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} else {
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"rtw_tkip_decrypt23a: stainfo!= NULL!!!\n");
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prwskey = &stainfo->dot118021x_UncstKey.skey[0];
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prwskeylen = 16;
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}
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iv = pframe + prxattrib->hdrlen;
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payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
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length = skb->len - prxattrib->hdrlen - prxattrib->iv_len;
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GET_TKIP_PN(iv, dot11txpn);
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pnl = (u16)(dot11txpn.val);
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pnh = (u32)(dot11txpn.val>>16);
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phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
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phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);
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/* 4 decrypt payload include icv */
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arcfour_init(&mycontext, rc4key, 16);
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arcfour_encrypt(&mycontext, payload, payload, length);
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*((u32 *)crc) = le32_to_cpu(getcrc32(payload, length - 4));
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if (crc[3] != payload[length - 1] || crc[2] != payload[length - 2] || crc[1] != payload[length - 3] || crc[0] != payload[length - 4])
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{
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RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
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"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",
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crc[3], payload[length - 1],
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crc[2], payload[length - 2],
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crc[1], payload[length - 3],
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crc[0], payload[length - 4]);
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res = _FAIL;
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}
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exit:
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return res;
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}
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