[PATCH] staging:r8188eu: Use lib80211 to support TKIP

From: Ivan Safonov
Date: Fri Mar 09 2018 - 11:48:53 EST

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Custom TKIP decryption replaced with lib80211 implementation.
MIC check use lib80211 too.

Signed-off-by: Ivan Safonov <insafonov@xxxxxxxxx>
---
drivers/staging/rtl8188eu/Kconfig | 1 +
drivers/staging/rtl8188eu/core/rtw_recv.c | 161 ++++++++------------------
drivers/staging/rtl8188eu/core/rtw_security.c | 92 +++++++--------
3 files changed, 94 insertions(+), 160 deletions(-)

diff --git a/drivers/staging/rtl8188eu/Kconfig b/drivers/staging/rtl8188eu/Kconfig
index ff7832798a77..673fdce25530 100644
--- a/drivers/staging/rtl8188eu/Kconfig
+++ b/drivers/staging/rtl8188eu/Kconfig
@@ -7,6 +7,7 @@ config R8188EU
select LIB80211
select LIB80211_CRYPT_WEP
select LIB80211_CRYPT_CCMP
+ select LIB80211_CRYPT_TKIP
---help---
This option adds the Realtek RTL8188EU USB device such as TP-Link TL-WN725N.
If built as a module, it will be called r8188eu.
diff --git a/drivers/staging/rtl8188eu/core/rtw_recv.c b/drivers/staging/rtl8188eu/core/rtw_recv.c
index c6857a5be12a..05936a45eb93 100644
--- a/drivers/staging/rtl8188eu/core/rtw_recv.c
+++ b/drivers/staging/rtl8188eu/core/rtw_recv.c
@@ -23,6 +23,7 @@
#include <mon.h>
#include <wifi.h>
#include <linux/vmalloc.h>
+#include <net/lib80211.h>

#define ETHERNET_HEADER_SIZE 14 /* Ethernet Header Length */
#define LLC_HEADER_SIZE 6 /* LLC Header Length */
@@ -220,31 +221,20 @@ u32 rtw_free_uc_swdec_pending_queue(struct adapter *adapter)
static int recvframe_chkmic(struct adapter *adapter,
struct recv_frame *precvframe)
{
- int i, res = _SUCCESS;
- u32 datalen;
- u8 miccode[8];
- u8 bmic_err = false, brpt_micerror = true;
- u8 *pframe, *payload, *pframemic;
- u8 *mickey;
- struct sta_info *stainfo;
- struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
- struct security_priv *psecuritypriv = &adapter->securitypriv;
-
- struct mlme_ext_priv *pmlmeext = &adapter->mlmeextpriv;
- struct mlme_ext_info *pmlmeinfo = &(pmlmeext->mlmext_info);
-
- stainfo = rtw_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);
+ int res = _SUCCESS;
+ struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
+ struct sta_info *stainfo = rtw_get_stainfo(&adapter->stapriv, prxattrib->ta);

if (prxattrib->encrypt == _TKIP_) {
- RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
- ("\n %s: prxattrib->encrypt==_TKIP_\n", __func__));
- RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
- ("\n %s: da=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
- __func__, prxattrib->ra[0], prxattrib->ra[1], prxattrib->ra[2],
- prxattrib->ra[3], prxattrib->ra[4], prxattrib->ra[5]));
-
- /* calculate mic code */
if (stainfo) {
+ int key_idx;
+ const int iv_len = 8, icv_len = 4, key_length = 32;
+ struct sk_buff *skb = precvframe->pkt;
+ u8 key[32], iv[8], icv[4], *pframe = skb->data;
+ void *crypto_private = NULL;
+ struct lib80211_crypto_ops *crypto_ops = try_then_request_module(lib80211_get_crypto_ops("TKIP"), "lib80211_crypt_tkip");
+ struct security_priv *psecuritypriv = &adapter->securitypriv;
+
if (IS_MCAST(prxattrib->ra)) {
if (!psecuritypriv) {
res = _FAIL;
@@ -253,115 +243,58 @@ static int recvframe_chkmic(struct adapter *adapter,
DBG_88E("\n %s: didn't install group key!!!!!!!!!!\n", __func__);
goto exit;
}
- mickey = &psecuritypriv->dot118021XGrprxmickey[prxattrib->key_index].skey[0];
-
- RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
- ("\n %s: bcmc key\n", __func__));
+ key_idx = prxattrib->key_index;
+ memcpy(key, psecuritypriv->dot118021XGrpKey[key_idx].skey, 16);
+ memcpy(key + 16, psecuritypriv->dot118021XGrprxmickey[key_idx].skey, 16);
} else {
- mickey = &stainfo->dot11tkiprxmickey.skey[0];
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
- ("\n %s: unicast key\n", __func__));
+ key_idx = 0;
+ memcpy(key, stainfo->dot118021x_UncstKey.skey, 16);
+ memcpy(key + 16, stainfo->dot11tkiprxmickey.skey, 16);
}

- /* icv_len included the mic code */
- datalen = precvframe->pkt->len-prxattrib->hdrlen -
- prxattrib->iv_len-prxattrib->icv_len-8;
- pframe = precvframe->pkt->data;
- payload = pframe+prxattrib->hdrlen+prxattrib->iv_len;
-
- RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n prxattrib->iv_len=%d prxattrib->icv_len=%d\n", prxattrib->iv_len, prxattrib->icv_len));
- rtw_seccalctkipmic(mickey, pframe, payload, datalen, &miccode[0],
- (unsigned char)prxattrib->priority); /* care the length of the data */
+ if (!crypto_ops) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }

- pframemic = payload+datalen;
+ memcpy(iv, pframe + prxattrib->hdrlen, iv_len);
+ memcpy(icv, pframe + skb->len - icv_len, icv_len);
+ memmove(pframe + iv_len, pframe, prxattrib->hdrlen);

- bmic_err = false;
+ skb_pull(skb, iv_len);
+ skb_trim(skb, skb->len - icv_len);

- for (i = 0; i < 8; i++) {
- if (miccode[i] != *(pframemic+i)) {
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
- ("%s: miccode[%d](%02x)!=*(pframemic+%d)(%02x) ",
- __func__, i, miccode[i], i, *(pframemic + i)));
- bmic_err = true;
- }
+ crypto_private = crypto_ops->init(key_idx);
+ if (!crypto_private) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }
+ if (crypto_ops->set_key(key, key_length, NULL, crypto_private) < 0) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }
+ if (crypto_ops->decrypt_msdu(skb, key_idx, prxattrib->hdrlen, crypto_private)) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
}

- if (bmic_err) {
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
- ("\n *(pframemic-8)-*(pframemic-1)=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
- *(pframemic-8), *(pframemic-7), *(pframemic-6),
- *(pframemic-5), *(pframemic-4), *(pframemic-3),
- *(pframemic-2), *(pframemic-1)));
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
- ("\n *(pframemic-16)-*(pframemic-9)=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
- *(pframemic-16), *(pframemic-15), *(pframemic-14),
- *(pframemic-13), *(pframemic-12), *(pframemic-11),
- *(pframemic-10), *(pframemic-9)));
- {
- uint i;
+ memmove(pframe, pframe + iv_len, prxattrib->hdrlen);
+ skb_push(skb, iv_len);
+ skb_put(skb, icv_len);

- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
- ("\n ======demp packet (len=%d)======\n",
- precvframe->pkt->len));
- for (i = 0; i < precvframe->pkt->len; i += 8) {
- RT_TRACE(_module_rtl871x_recv_c_,
- _drv_err_,
- ("0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x",
- *(precvframe->pkt->data+i),
- *(precvframe->pkt->data+i+1),
- *(precvframe->pkt->data+i+2),
- *(precvframe->pkt->data+i+3),
- *(precvframe->pkt->data+i+4),
- *(precvframe->pkt->data+i+5),
- *(precvframe->pkt->data+i+6),
- *(precvframe->pkt->data+i+7)));
- }
- RT_TRACE(_module_rtl871x_recv_c_,
- _drv_err_,
- ("\n ====== demp packet end [len=%d]======\n",
- precvframe->pkt->len));
- RT_TRACE(_module_rtl871x_recv_c_,
- _drv_err_,
- ("\n hrdlen=%d,\n",
- prxattrib->hdrlen));
- }
+ memcpy(pframe + prxattrib->hdrlen, iv, iv_len);
+ memcpy(pframe + skb->len - icv_len, icv, icv_len);

- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
- ("ra=0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x psecuritypriv->binstallGrpkey=%d ",
- prxattrib->ra[0], prxattrib->ra[1], prxattrib->ra[2],
- prxattrib->ra[3], prxattrib->ra[4], prxattrib->ra[5], psecuritypriv->binstallGrpkey));
-
- /* double check key_index for some timing issue , */
- /* cannot compare with psecuritypriv->dot118021XGrpKeyid also cause timing issue */
- if ((IS_MCAST(prxattrib->ra) == true) && (prxattrib->key_index != pmlmeinfo->key_index))
- brpt_micerror = false;
-
- if ((prxattrib->bdecrypted) && (brpt_micerror)) {
- rtw_handle_tkip_mic_err(adapter, (u8)IS_MCAST(prxattrib->ra));
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" mic error :prxattrib->bdecrypted=%d ", prxattrib->bdecrypted));
- DBG_88E(" mic error :prxattrib->bdecrypted=%d\n", prxattrib->bdecrypted);
- } else {
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" mic error :prxattrib->bdecrypted=%d ", prxattrib->bdecrypted));
- DBG_88E(" mic error :prxattrib->bdecrypted=%d\n", prxattrib->bdecrypted);
- }
- res = _FAIL;
- } else {
- /* mic checked ok */
- if ((!psecuritypriv->bcheck_grpkey) && (IS_MCAST(prxattrib->ra))) {
- psecuritypriv->bcheck_grpkey = true;
- RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("psecuritypriv->bcheck_grpkey = true"));
- }
- }
+exit_lib80211_tkip:
+ if (crypto_ops && crypto_private)
+ crypto_ops->deinit(crypto_private);
} else {
RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
("%s: rtw_get_stainfo==NULL!!!\n", __func__));
}
-
- skb_trim(precvframe->pkt, precvframe->pkt->len - 8);
}

exit:
-
return res;
}

diff --git a/drivers/staging/rtl8188eu/core/rtw_security.c b/drivers/staging/rtl8188eu/core/rtw_security.c
index 67a2490f055e..bfe0b217e679 100644
--- a/drivers/staging/rtl8188eu/core/rtw_security.c
+++ b/drivers/staging/rtl8188eu/core/rtw_security.c
@@ -650,71 +650,71 @@ u32 rtw_tkip_encrypt(struct adapter *padapter, u8 *pxmitframe)
return res;
}

-/* The hlen isn't include the IV */
u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
-{ /* exclude ICV */
- u16 pnl;
- u32 pnh;
- u8 rc4key[16];
- u8 ttkey[16];
- u8 crc[4];
- struct arc4context mycontext;
- int length;
-
- u8 *pframe, *payload, *iv, *prwskey;
- union pn48 dot11txpn;
- struct sta_info *stainfo;
- struct rx_pkt_attrib *prxattrib = &((struct recv_frame *)precvframe)->attrib;
- struct security_priv *psecuritypriv = &padapter->securitypriv;
- u32 res = _SUCCESS;
-
-
- pframe = (unsigned char *)((struct recv_frame *)precvframe)->pkt->data;
+{
+ struct rx_pkt_attrib *prxattrib = &((struct recv_frame *)precvframe)->attrib;
+ u32 res = _SUCCESS;

/* 4 start to decrypt recvframe */
if (prxattrib->encrypt == _TKIP_) {
- stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
+ struct sta_info *stainfo = rtw_get_stainfo(&padapter->stapriv, prxattrib->ta);
+
if (stainfo) {
+ int key_idx;
+ const int iv_len = 8, icv_len = 4, key_length = 32;
+ void *crypto_private = NULL;
+ struct sk_buff *skb = ((struct recv_frame *)precvframe)->pkt;
+ u8 key[32], iv[8], icv[4], *pframe = skb->data;
+ struct lib80211_crypto_ops *crypto_ops = try_then_request_module(lib80211_get_crypto_ops("TKIP"), "lib80211_crypt_tkip");
+ struct security_priv *psecuritypriv = &padapter->securitypriv;
+
if (IS_MCAST(prxattrib->ra)) {
if (!psecuritypriv->binstallGrpkey) {
res = _FAIL;
DBG_88E("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
goto exit;
}
- prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
+ key_idx = prxattrib->key_index;
+ memcpy(key, psecuritypriv->dot118021XGrpKey[key_idx].skey, 16);
+ memcpy(key + 16, psecuritypriv->dot118021XGrprxmickey[key_idx].skey, 16);
} else {
- RT_TRACE(_module_rtl871x_security_c_, _drv_err_, ("%s: stainfo!= NULL!!!\n", __func__));
- prwskey = &stainfo->dot118021x_UncstKey.skey[0];
+ key_idx = 0;
+ memcpy(key, stainfo->dot118021x_UncstKey.skey, 16);
+ memcpy(key + 16, stainfo->dot11tkiprxmickey.skey, 16);
}

- iv = pframe+prxattrib->hdrlen;
- payload = pframe+prxattrib->iv_len+prxattrib->hdrlen;
- length = ((struct recv_frame *)precvframe)->pkt->len-prxattrib->hdrlen-prxattrib->iv_len;
-
- GET_TKIP_PN(iv, dot11txpn);
-
- pnl = (u16)(dot11txpn.val);
- pnh = (u32)(dot11txpn.val>>16);
+ if (!crypto_ops) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }

- phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
- phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);
+ memcpy(iv, pframe + prxattrib->hdrlen, iv_len);
+ memcpy(icv, pframe + skb->len - icv_len, icv_len);

- /* 4 decrypt payload include icv */
+ crypto_private = crypto_ops->init(key_idx);
+ if (!crypto_private) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }
+ if (crypto_ops->set_key(key, key_length, NULL, crypto_private) < 0) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }
+ if (crypto_ops->decrypt_mpdu(skb, prxattrib->hdrlen, crypto_private)) {
+ res = _FAIL;
+ goto exit_lib80211_tkip;
+ }

- arcfour_init(&mycontext, rc4key, 16);
- arcfour_encrypt(&mycontext, payload, payload, length);
+ memmove(pframe, pframe + iv_len, prxattrib->hdrlen);
+ skb_push(skb, iv_len);
+ skb_put(skb, icv_len);

- *((__le32 *)crc) = getcrc32(payload, length-4);
+ memcpy(pframe + prxattrib->hdrlen, iv, iv_len);
+ memcpy(pframe + skb->len - icv_len, icv, icv_len);

- 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_decrypt:icv error crc (%4ph)!=payload (%4ph)\n",
- &crc, &payload[length-4]));
- res = _FAIL;
- }
+exit_lib80211_tkip:
+ if (crypto_ops && crypto_private)
+ crypto_ops->deinit(crypto_private);
} else {
RT_TRACE(_module_rtl871x_security_c_, _drv_err_, ("rtw_tkip_decrypt: stainfo==NULL!!!\n"));
res = _FAIL;
--
2.16.1

Next message: SF Markus Elfring: "[PATCH v2 16/17] mfd: twl6030-irq: Delete an error message for a failed memory allocation in twl6030_init_irq()"
Previous message: Sebastian Reichel: "Re: [PATCHv5 3/5] mfd: motorola-cpcap: Add audio-codec support"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]