This is a note to let you know that I've just added the patch titled

staging: rtl8188eu: Revert 4 commits breaking ARP

to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: staging-rtl8188eu-revert-4-commits-breaking-arp.patch and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 66d32fdcbf03851724a8b551d490ae1ddfe6eef2 Mon Sep 17 00:00:00 2001

From: Hans de Goede hdegoede@redhat.com Date: Thu, 2 Nov 2017 10:30:13 +0100 Subject: staging: rtl8188eu: Revert 4 commits breaking ARP

From: Hans de Goede hdegoede@redhat.com

commit 66d32fdcbf03851724a8b551d490ae1ddfe6eef2 upstream.

Commit 2ba8444c97b1 ("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 79650ffde38e ("staging:r8188eu: trim IV/ICV fields in validate_recv_data_frame()") This commit depends on 2 of the other commits being reverted.

2. Commit 02b19b4c4920 ("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 d86e16da6a5d ("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 2ba8444c97b1 ("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: Ivan Safonov insafonov@gmail.com Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/staging/rtl8188eu/core/rtw_recv.c | 83 ++++++++++++++++++------------ drivers/staging/rtl8188eu/os_dep/mon.c | 34 +----------- 2 files changed, 55 insertions(+), 62 deletions(-)

--- a/drivers/staging/rtl8188eu/core/rtw_recv.c +++ b/drivers/staging/rtl8188eu/core/rtw_recv.c @@ -259,10 +259,12 @@ static int recvframe_chkmic(struct adapt }

/* 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 */

@@ -407,15 +409,9 @@ static struct recv_frame *decryptor(stru 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); @@ -456,7 +452,7 @@ static struct recv_frame *portctrl(struc

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);

@@ -1138,8 +1134,6 @@ static int validate_recv_data_frame(stru }

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)));

@@ -1148,13 +1142,6 @@ static int validate_recv_data_frame(stru 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; @@ -1274,7 +1261,6 @@ static int validate_recv_frame(struct ad * 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: @@ -1296,8 +1282,11 @@ static int wlanhdr_to_ethhdr(struct recv 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) && @@ -1310,9 +1299,12 @@ static int wlanhdr_to_ethhdr(struct recv 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; @@ -1337,6 +1329,7 @@ static struct recv_frame *recvframe_defr struct __queue *defrag_q) { struct list_head *plist, *phead; + u8 wlanhdr_offset; u8 curfragnum; struct recv_frame *pfhdr, *pnfhdr; struct recv_frame *prframe, *pnextrframe; @@ -1385,7 +1378,12 @@ static struct recv_frame *recvframe_defr /* 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, @@ -1393,7 +1391,7 @@ static struct recv_frame *recvframe_defr

skb_put(prframe->pkt, pnfhdr->pkt->len);

- pfhdr->attrib.icv_len = 0; + pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len; plist = plist->next; }

@@ -1519,6 +1517,11 @@ static int amsdu_to_msdu(struct adapter 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; @@ -1887,6 +1890,24 @@ static int process_recv_indicatepkts(str 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) { @@ -1939,7 +1960,6 @@ static int recv_func(struct adapter *pad 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) { @@ -1951,12 +1971,9 @@ static int recv_func(struct adapter *pad } }

- /* 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 && --- a/drivers/staging/rtl8188eu/os_dep/mon.c +++ b/drivers/staging/rtl8188eu/os_dep/mon.c @@ -66,34 +66,6 @@ static void mon_recv_decrypted(struct ne 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 ne 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_de 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); }

Patches currently in stable-queue which might be from hdegoede@redhat.com are

queue-4.13/staging-rtl8188eu-revert-4-commits-breaking-arp.patch queue-4.13/platform-x86-peaq-wmi-add-dmi-check-before-binding-to-the-wmi-interface.patch queue-4.13/platform-x86-peaq_wmi-fix-missing-terminating-entry-for-peaq_dmi_table.patch queue-4.13/staging-vboxvideo-fix-reporting-invalid-suggested-offset-properties.patch