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rtl8812a: do not overwrite sequence number of injected frames

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The sequence number of inject frames was being overwritten. This prevents
certain older attacks against WEP fragmentation older TKIP attacks. Fix
this by tracking if a frames was injected in monitor mode, and if so, do
not overwrite its sequence number.

The patch also adds a module parameter to revert this behaviour if needed.
By setting rtw_monitor_overwrite_seqnum to 1, sequence numbers will again
be set by the driver/device. This may by useful if user-space relied on
the driver/device to set sequence numbers.

This patch was tested using an Alfa AWUS036ACH.
This commit is contained in:
Mathy Vanhoef 2020-06-26 09:27:51 +04:00
parent df2b8dfd8c
commit 1b86121806
5 changed files with 17 additions and 2 deletions
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1
core/rtw_xmit.c
View File

@ -4460,6 +4460,7 @@ s32 rtw_monitor_xmit_entry(struct sk_buff *skb, struct net_device *ndev)
/* Check DATA/MGNT frames */
pwlanhdr = (struct rtw_ieee80211_hdr *)pframe;
pattrib = &pmgntframe->attrib;
pattrib->injected = _TRUE;
if (pregpriv->monitor_disable_1m) {

11
hal/rtl8812a/usb/rtl8812au_xmit.c
View File

@ -60,6 +60,7 @@ static s32 update_txdesc(struct xmit_frame *pxmitframe, u8 *pmem, s32 sz , u8 ba
#endif/*CONFIG_80211N_HT*/
u8 vht_max_ampdu_size = 0;
struct dvobj_priv *pdvobjpriv = adapter_to_dvobj(padapter);
struct registry_priv *pregpriv = &(padapter->registrypriv);
#ifndef CONFIG_USE_USB_BUFFER_ALLOC_TX
if (padapter->registrypriv.mp_mode == 0) {
@ -115,10 +116,16 @@ static s32 update_txdesc(struct xmit_frame *pxmitframe, u8 *pmem, s32 sz , u8 ba
/* offset 12 */
if (!pattrib->qos_en) {
if (pattrib->injected == _TRUE && !pregpriv->monitor_overwrite_seqnum) {
/* Prevent sequence number from being overwritten */
SET_TX_DESC_HWSEQ_EN_8812(ptxdesc, 0); /* Hw do not set sequence number */
SET_TX_DESC_SEQ_8812(ptxdesc, pattrib->seqnum); /* Copy inject sequence number to TxDesc */
}
else if (!pattrib->qos_en) {
SET_TX_DESC_HWSEQ_EN_8812(ptxdesc, 1); /* Hw set sequence number */
} else
} else {
SET_TX_DESC_SEQ_8812(ptxdesc, pattrib->seqnum);
}
if ((pxmitframe->frame_tag & 0x0f) == DATA_FRAMETAG) {
/* RTW_INFO("pxmitframe->frame_tag == DATA_FRAMETAG\n"); */

1
include/drv_types.h
View File

@ -458,6 +458,7 @@ struct registry_priv {
u8 tdmadig_dynamic;
#endif/*CONFIG_TDMADIG*/
u8 monitor_overwrite_seqnum;
u8 monitor_disable_1m;
};

1
include/rtw_xmit.h
View File

@ -465,6 +465,7 @@ struct pkt_attrib {
#endif /* CONFIG_WMMPS_STA */
struct sta_info *psta;
u8 injected;
u8 rtsen;
u8 cts2self;

5
os_dep/linux/os_intfs.c
View File

@ -72,6 +72,10 @@ int rtw_scan_mode = 1;/* active, passive */
int rtw_lps_chk_by_tp = 0;
#endif /* CONFIG_POWER_SAVING */
int rtw_monitor_overwrite_seqnum = 0;
module_param(rtw_monitor_overwrite_seqnum, int, 0644);
MODULE_PARM_DESC(rtw_monitor_overwrite_seqnum, "Overwrite the sequence number of injected frames");
int rtw_monitor_disable_1m = 0;
module_param(rtw_monitor_disable_1m, int, 0644);
MODULE_PARM_DESC(rtw_monitor_disable_1m, "Disable default 1Mbps rate for monitor injected frames");
@ -1223,6 +1227,7 @@ uint loadparam(_adapter *padapter)
registry_par->fw_tbtt_rpt = rtw_tbtt_rpt;
#endif
registry_par->monitor_overwrite_seqnum = (u8)rtw_monitor_overwrite_seqnum;
registry_par->monitor_disable_1m = (u8)rtw_monitor_disable_1m;
return status;