system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-10-09 21:05:10 +00:00
Code Issues Packages Projects Releases Wiki Activity

staging: rtl8188eu: Revert 4 commits breaking ARP

Browse source 
Commit 2ba8444c97 ("staging:r8188eu: move IV/ICV trimming into
decrypt() and also place it after rtl88eu_mon_recv_hook()") breaks ARP.

After this commit ssh-ing to a laptop with r8188eu wifi no longer works
if the machine connecting has never communicated with the laptop before.
This is 100% reproducable using "arp -d <ipv4> && ssh <ipv4>" to ssh to
a laptop with r8188eu wifi.

This commit reverts 4 commits in total:

1. Commit 79650ffde3 ("staging:r8188eu: trim IV/ICV fields in
   validate_recv_data_frame()")
This commit depends on 2 of the other commits being reverted.

2. Commit 02b19b4c49 ("staging:r8188eu: inline unprotect_frame() in
   mon_recv_decrypted_recv()")
The inline code is wrong the un-inlined version contains:
	if (skb->len < hdr_len + iv_len + icv_len)
		return;
	...
Where as the inline-ed code introduced by this commit does:
	if (skb->len < hdr_len + iv_len + icv_len) {
		...
Note the same check, but now to actually continue doing ... instead
of to not do it, so this commit is no good.

3. Commit d86e16da6a ("staging:r8188eu: use different mon_recv_decrypted()
   inside rtl88eu_mon_recv_hook() and rtl88eu_mon_xmit_hook().")
This commit introduced a 1:1 copy of a function so that one of the
2 copies can be modified in the 2 commits we're already reverting.

4. Commit 2ba8444c97 ("staging:r8188eu: move IV/ICV trimming into
   decrypt() and also place it after rtl88eu_mon_recv_hook()")
This is the commit actually breaking ARP.

Note this commit is a straight-forward squash of the revert of these
4 commits, without any changes.

Cc: stable@vger.kernel.org
Cc: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2017-11-02 10:30:13 +01:00 committed by Greg Kroah-Hartman
parent d96e8c10f8
commit 66d32fdcbf
2 changed files with 55 additions and 62 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

83
drivers/staging/rtl8188eu/core/rtw_recv.c
View file

@ -264,10 +264,12 @@ static int recvframe_chkmic(struct adapter *adapter,
}
/* icv_len included the mic code */
datalen = precvframe->pkt->len-prxattrib->hdrlen - 8;
datalen = precvframe->pkt->len-prxattrib->hdrlen -
prxattrib->iv_len-prxattrib->icv_len-8;
pframe = precvframe->pkt->data;
payload = pframe+prxattrib->hdrlen;
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 */
@ -413,15 +415,9 @@ static struct recv_frame *decryptor(struct adapter *padapter,
default:
break;
}
if (res != _FAIL) {
memmove(precv_frame->pkt->data + precv_frame->attrib.iv_len, precv_frame->pkt->data, precv_frame->attrib.hdrlen);
skb_pull(precv_frame->pkt, precv_frame->attrib.iv_len);
skb_trim(precv_frame->pkt, precv_frame->pkt->len - precv_frame->attrib.icv_len);
}
} else if (prxattrib->bdecrypted == 1 && prxattrib->encrypt > 0 &&
(psecuritypriv->busetkipkey == 1 || prxattrib->encrypt != _TKIP_)) {
psecuritypriv->hw_decrypted = true;
}
(psecuritypriv->busetkipkey == 1 || prxattrib->encrypt != _TKIP_))
psecuritypriv->hw_decrypted = true;
if (res == _FAIL) {
rtw_free_recvframe(return_packet, &padapter->recvpriv.free_recv_queue);
@ -462,7 +458,7 @@ static struct recv_frame *portctrl(struct adapter *adapter,
if (auth_alg == 2) {
/* get ether_type */
ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE + pfhdr->attrib.iv_len;
memcpy(&be_tmp, ptr, 2);
ether_type = ntohs(be_tmp);
@ -1145,8 +1141,6 @@ static int validate_recv_data_frame(struct adapter *adapter,
}
if (pattrib->privacy) {
struct sk_buff *skb = precv_frame->pkt;
RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("validate_recv_data_frame:pattrib->privacy=%x\n", pattrib->privacy));
RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n ^^^^^^^^^^^IS_MCAST(pattrib->ra(0x%02x))=%d^^^^^^^^^^^^^^^6\n", pattrib->ra[0], IS_MCAST(pattrib->ra)));
@ -1155,13 +1149,6 @@ static int validate_recv_data_frame(struct adapter *adapter,
RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n pattrib->encrypt=%d\n", pattrib->encrypt));
SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len, pattrib->encrypt);
if (pattrib->bdecrypted == 1 && pattrib->encrypt > 0) {
memmove(skb->data + pattrib->iv_len,
skb->data, pattrib->hdrlen);
skb_pull(skb, pattrib->iv_len);
skb_trim(skb, skb->len - pattrib->icv_len);
}
} else {
pattrib->encrypt = 0;
pattrib->iv_len = 0;
@ -1281,7 +1268,6 @@ static int validate_recv_frame(struct adapter *adapter,
* Hence forward the frame to the monitor anyway to preserve the order
* in which frames were received.
*/
rtl88eu_mon_recv_hook(adapter->pmondev, precv_frame);
exit:
@ -1303,8 +1289,11 @@ static int wlanhdr_to_ethhdr(struct recv_frame *precvframe)
u8 *ptr = precvframe->pkt->data;
struct rx_pkt_attrib *pattrib = &precvframe->attrib;
psnap = (struct ieee80211_snap_hdr *)(ptr+pattrib->hdrlen);
psnap_type = ptr+pattrib->hdrlen + SNAP_SIZE;
if (pattrib->encrypt)
skb_trim(precvframe->pkt, precvframe->pkt->len - pattrib->icv_len);
psnap = (struct ieee80211_snap_hdr *)(ptr+pattrib->hdrlen + pattrib->iv_len);
psnap_type = ptr+pattrib->hdrlen + pattrib->iv_len+SNAP_SIZE;
/* convert hdr + possible LLC headers into Ethernet header */
if ((!memcmp(psnap, rtw_rfc1042_header, SNAP_SIZE) &&
(!memcmp(psnap_type, SNAP_ETH_TYPE_IPX, 2) == false) &&
@ -1317,9 +1306,12 @@ static int wlanhdr_to_ethhdr(struct recv_frame *precvframe)
bsnaphdr = false;
}
rmv_len = pattrib->hdrlen + (bsnaphdr ? SNAP_SIZE : 0);
rmv_len = pattrib->hdrlen + pattrib->iv_len + (bsnaphdr ? SNAP_SIZE : 0);
len = precvframe->pkt->len - rmv_len;
RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
("\n===pattrib->hdrlen: %x, pattrib->iv_len:%x===\n\n", pattrib->hdrlen, pattrib->iv_len));
memcpy(&be_tmp, ptr+rmv_len, 2);
eth_type = ntohs(be_tmp); /* pattrib->ether_type */
pattrib->eth_type = eth_type;
@ -1344,6 +1336,7 @@ static struct recv_frame *recvframe_defrag(struct adapter *adapter,
struct __queue *defrag_q)
{
struct list_head *plist, *phead;
u8 wlanhdr_offset;
u8 curfragnum;
struct recv_frame *pfhdr, *pnfhdr;
struct recv_frame *prframe, *pnextrframe;
@ -1392,7 +1385,12 @@ static struct recv_frame *recvframe_defrag(struct adapter *adapter,
/* copy the 2nd~n fragment frame's payload to the first fragment */
/* get the 2nd~last fragment frame's payload */
skb_pull(pnextrframe->pkt, pnfhdr->attrib.hdrlen);
wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
skb_pull(pnextrframe->pkt, wlanhdr_offset);
/* append to first fragment frame's tail (if privacy frame, pull the ICV) */
skb_trim(prframe->pkt, prframe->pkt->len - pfhdr->attrib.icv_len);
/* memcpy */
memcpy(skb_tail_pointer(pfhdr->pkt), pnfhdr->pkt->data,
@ -1400,7 +1398,7 @@ static struct recv_frame *recvframe_defrag(struct adapter *adapter,
skb_put(prframe->pkt, pnfhdr->pkt->len);
pfhdr->attrib.icv_len = 0;
pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
plist = plist->next;
}
@ -1526,6 +1524,11 @@ static int amsdu_to_msdu(struct adapter *padapter, struct recv_frame *prframe)
nr_subframes = 0;
pattrib = &prframe->attrib;
skb_pull(prframe->pkt, prframe->attrib.hdrlen);
if (prframe->attrib.iv_len > 0)
skb_pull(prframe->pkt, prframe->attrib.iv_len);
a_len = prframe->pkt->len;
pdata = prframe->pkt->data;
@ -1895,6 +1898,24 @@ static int process_recv_indicatepkts(struct adapter *padapter,
return retval;
}
static int recv_func_prehandle(struct adapter *padapter,
struct recv_frame *rframe)
{
int ret = _SUCCESS;
struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
/* check the frame crtl field and decache */
ret = validate_recv_frame(padapter, rframe);
if (ret != _SUCCESS) {
RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("recv_func: validate_recv_frame fail! drop pkt\n"));
rtw_free_recvframe(rframe, pfree_recv_queue);/* free this recv_frame */
goto exit;
}
exit:
return ret;
}
static int recv_func_posthandle(struct adapter *padapter,
struct recv_frame *prframe)
{
@ -1947,7 +1968,6 @@ static int recv_func(struct adapter *padapter, struct recv_frame *rframe)
struct rx_pkt_attrib *prxattrib = &rframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
struct mlme_priv *mlmepriv = &padapter->mlmepriv;
struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
/* check if need to handle uc_swdec_pending_queue*/
if (check_fwstate(mlmepriv, WIFI_STATION_STATE) && psecuritypriv->busetkipkey) {
@ -1959,12 +1979,9 @@ static int recv_func(struct adapter *padapter, struct recv_frame *rframe)
}
}
/* check the frame crtl field and decache */
ret = validate_recv_frame(padapter, rframe);
if (ret != _SUCCESS) {
RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("recv_func: validate_recv_frame fail! drop pkt\n"));
rtw_free_recvframe(rframe, pfree_recv_queue);/* free this recv_frame */
} else {
ret = recv_func_prehandle(padapter, rframe);
if (ret == _SUCCESS) {
/* check if need to enqueue into uc_swdec_pending_queue*/
if (check_fwstate(mlmepriv, WIFI_STATION_STATE) &&
!IS_MCAST(prxattrib->ra) && prxattrib->encrypt > 0 &&

34
drivers/staging/rtl8188eu/os_dep/mon.c
View file

@ -66,34 +66,6 @@ static void mon_recv_decrypted(struct net_device *dev, const u8 *data,
netif_rx(skb);
}
static void mon_recv_decrypted_recv(struct net_device *dev, const u8 *data,
int data_len)
{
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
int hdr_len;
skb = netdev_alloc_skb(dev, data_len);
if (!skb)
return;
memcpy(skb_put(skb, data_len), data, data_len);
/*
* Frame data is not encrypted. Strip off protection so
* userspace doesn't think that it is.
*/
hdr = (struct ieee80211_hdr *)skb->data;
hdr_len = ieee80211_hdrlen(hdr->frame_control);
if (ieee80211_has_protected(hdr->frame_control))
hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_PROTECTED);
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
}
static void mon_recv_encrypted(struct net_device *dev, const u8 *data,
int data_len)
{
@ -110,6 +82,7 @@ static void mon_recv_encrypted(struct net_device *dev, const u8 *data,
void rtl88eu_mon_recv_hook(struct net_device *dev, struct recv_frame *frame)
{
struct rx_pkt_attrib *attr;
int iv_len, icv_len;
int data_len;
u8 *data;
@ -122,8 +95,11 @@ void rtl88eu_mon_recv_hook(struct net_device *dev, struct recv_frame *frame)
data = frame->pkt->data;
data_len = frame->pkt->len;
/* Broadcast and multicast frames don't have attr->{iv,icv}_len set */
SET_ICE_IV_LEN(iv_len, icv_len, attr->encrypt);
if (attr->bdecrypted)
mon_recv_decrypted_recv(dev, data, data_len);
mon_recv_decrypted(dev, data, data_len, iv_len, icv_len);
else
mon_recv_encrypted(dev, data, data_len);
}