diff mbox series

[2/6,next] cfg80211: Avoid clashing function prototypes

Message ID	291de76bc7cd5c21dc2f2471382ab0caaf625b22.1666038048.git.gustavoars@kernel.org
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Date: Mon, 17 Oct 2022 15:34:22 -0500 From: "Gustavo A. R. Silva" <gustavoars@kernel.org> To: Johannes Berg <johannes@sipsolutions.net>, Kalle Valo <kvalo@kernel.org>, "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com> Cc: netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>, "Gustavo A. R. Silva" <gustavoars@kernel.org>, linux-hardening@vger.kernel.org Subject: [PATCH 2/6][next] cfg80211: Avoid clashing function prototypes Message-ID: <291de76bc7cd5c21dc2f2471382ab0caaf625b22.1666038048.git.gustavoars@kernel.org> References: <cover.1666038048.git.gustavoars@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <cover.1666038048.git.gustavoars@kernel.org> Precedence: bulk
Series	Avoid clashing function prototypes \| [0/6,next] Avoid clashing function prototypes [1/6,next] orinoco: Avoid clashing function prototypes [2/6,next] cfg80211: Avoid clashing function prototypes [3/6,next] ipw2x00: Remove unnecessary cast to iw_handler in ipw_wx_handlers [4/6,next] hostap: Avoid clashing function prototypes [5/6,next] zd1201: Avoid clashing function prototypes [6/6,next] airo: Avoid clashing function prototypes

Commit Message

Gustavo A. R. Silva Oct. 17, 2022, 8:34 p.m. UTC

  When built with Control Flow Integrity, function prototypes between
caller and function declaration must match. These mismatches are visible
at compile time with the new -Wcast-function-type-strict in Clang[1].

Fix a total of 10 warnings like these:

../drivers/net/wireless/intersil/orinoco/wext.c:1390:27: error: incompatible function pointer types initializing 'const iw_handler' (aka 'int (*const)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') with an expression of type 'int (struct net_device *, struct iw_request_info *, struct iw_param *, char *)' [-Wincompatible-function-pointer-types]
        IW_HANDLER(SIOCGIWRETRY,        cfg80211_wext_giwretry),
                                        ^~~~~~~~~~~~~~~~~~~~~~
../include/uapi/linux/wireless.h:357:23: note: expanded from macro 'IW_HANDLER'
        [IW_IOCTL_IDX(id)] = func

The cfg80211 Wireless Extension handler callbacks (iw_handler) use a
union for the data argument. Actually use the union and perform explicit
member selection in the function body instead of having a function
prototype mismatch. No significant binary differences were seen 
before/after changes.

Link: https://github.com/KSPP/linux/issues/234
Link: https://reviews.llvm.org/D134831 [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/net/wireless/intersil/orinoco/wext.c |  22 +--
 include/net/cfg80211-wext.h                  |  20 +--
 net/wireless/scan.c                          |   3 +-
 net/wireless/wext-compat.c                   | 180 +++++++++----------
 net/wireless/wext-compat.h                   |   8 +-
 net/wireless/wext-sme.c                      |   5 +-
 6 files changed, 112 insertions(+), 126 deletions(-)

Comments

Kees Cook Oct. 18, 2022, 2:41 a.m. UTC | #1

On Mon, Oct 17, 2022 at 03:34:22PM -0500, Gustavo A. R. Silva wrote:
> When built with Control Flow Integrity, function prototypes between
> caller and function declaration must match. These mismatches are visible
> at compile time with the new -Wcast-function-type-strict in Clang[1].
> 
> Fix a total of 10 warnings like these:
> 
> ../drivers/net/wireless/intersil/orinoco/wext.c:1390:27: error: incompatible function pointer types initializing 'const iw_handler' (aka 'int (*const)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') with an expression of type 'int (struct net_device *, struct iw_request_info *, struct iw_param *, char *)' [-Wincompatible-function-pointer-types]
>         IW_HANDLER(SIOCGIWRETRY,        cfg80211_wext_giwretry),
>                                         ^~~~~~~~~~~~~~~~~~~~~~
> ../include/uapi/linux/wireless.h:357:23: note: expanded from macro 'IW_HANDLER'
>         [IW_IOCTL_IDX(id)] = func
> 
> The cfg80211 Wireless Extension handler callbacks (iw_handler) use a
> union for the data argument. Actually use the union and perform explicit
> member selection in the function body instead of having a function
> prototype mismatch. No significant binary differences were seen
> before/after changes.
> 
> Link: https://github.com/KSPP/linux/issues/234
> Link: https://reviews.llvm.org/D134831 [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/net/wireless/intersil/orinoco/wext.c |  22 +--
>  include/net/cfg80211-wext.h                  |  20 +--
>  net/wireless/scan.c                          |   3 +-
>  net/wireless/wext-compat.c                   | 180 +++++++++----------
>  net/wireless/wext-compat.h                   |   8 +-
>  net/wireless/wext-sme.c                      |   5 +-
>  6 files changed, 112 insertions(+), 126 deletions(-)
> 
> diff --git a/drivers/net/wireless/intersil/orinoco/wext.c b/drivers/net/wireless/intersil/orinoco/wext.c
> index b8eb5d60192f..dea1ff044342 100644
> --- a/drivers/net/wireless/intersil/orinoco/wext.c
> +++ b/drivers/net/wireless/intersil/orinoco/wext.c
> @@ -1363,31 +1363,31 @@ static const struct iw_priv_args orinoco_privtab[] = {
>  
>  static const iw_handler	orinoco_handler[] = {
>  	IW_HANDLER(SIOCSIWCOMMIT,	orinoco_ioctl_commit),
> -	IW_HANDLER(SIOCGIWNAME,		(iw_handler)cfg80211_wext_giwname),
> +	IW_HANDLER(SIOCGIWNAME,		cfg80211_wext_giwname),

This hunk should be in the orinoco patch, I think?


> [...]
> +	[IW_IOCTL_IDX(SIOCGIWRETRY)]    = cfg80211_wext_giwretry,

The common practice seems to be to use IW_HANDLER instead of open-coding
it like this.

	IW_HANDLER(SIOCGIWRETRY,	cfg80211_wext_giwretry),

Gustavo A. R. Silva Oct. 18, 2022, 7:31 p.m. UTC | #2

On 10/17/22 21:41, Kees Cook wrote:

>>   
>>   static const iw_handler	orinoco_handler[] = {
>>   	IW_HANDLER(SIOCSIWCOMMIT,	orinoco_ioctl_commit),
>> -	IW_HANDLER(SIOCGIWNAME,		(iw_handler)cfg80211_wext_giwname),
>> +	IW_HANDLER(SIOCGIWNAME,		cfg80211_wext_giwname),
> 
> This hunk should be in the orinoco patch, I think?

I just didn't want to have this huge patch touching multiple
different files. That's why I decided to split it up into three
separate patches.

But yeah; now it seems like a good idea to merge patches 1 to 3
into just a single patch.

> 
> 
>> [...]
>> +	[IW_IOCTL_IDX(SIOCGIWRETRY)]    = cfg80211_wext_giwretry,
> 
> The common practice seems to be to use IW_HANDLER instead of open-coding
> it like this.
> 
> 	IW_HANDLER(SIOCGIWRETRY,	cfg80211_wext_giwretry),

Yeah; I forget this after reverting Sami's changes:

32fc4a9ad56f ("cfg80211: fix callback type mismatches in wext-compat")

I'll fix it up. :)

Thanks for the feedback!
--
Gustavo

diff mbox series

Patch

diff --git a/drivers/net/wireless/intersil/orinoco/wext.c b/drivers/net/wireless/intersil/orinoco/wext.c
index b8eb5d60192f..dea1ff044342 100644
--- a/drivers/net/wireless/intersil/orinoco/wext.c
+++ b/drivers/net/wireless/intersil/orinoco/wext.c
@@ -1363,31 +1363,31 @@  static const struct iw_priv_args orinoco_privtab[] = {
 
 static const iw_handler	orinoco_handler[] = {
 	IW_HANDLER(SIOCSIWCOMMIT,	orinoco_ioctl_commit),
-	IW_HANDLER(SIOCGIWNAME,		(iw_handler)cfg80211_wext_giwname),
+	IW_HANDLER(SIOCGIWNAME,		cfg80211_wext_giwname),
 	IW_HANDLER(SIOCSIWFREQ,		orinoco_ioctl_setfreq),
 	IW_HANDLER(SIOCGIWFREQ,		orinoco_ioctl_getfreq),
-	IW_HANDLER(SIOCSIWMODE,		(iw_handler)cfg80211_wext_siwmode),
-	IW_HANDLER(SIOCGIWMODE,		(iw_handler)cfg80211_wext_giwmode),
+	IW_HANDLER(SIOCSIWMODE,		cfg80211_wext_siwmode),
+	IW_HANDLER(SIOCGIWMODE,		cfg80211_wext_giwmode),
 	IW_HANDLER(SIOCSIWSENS,		orinoco_ioctl_setsens),
 	IW_HANDLER(SIOCGIWSENS,		orinoco_ioctl_getsens),
-	IW_HANDLER(SIOCGIWRANGE,	(iw_handler)cfg80211_wext_giwrange),
+	IW_HANDLER(SIOCGIWRANGE,	cfg80211_wext_giwrange),
 	IW_HANDLER(SIOCSIWSPY,		iw_handler_set_spy),
 	IW_HANDLER(SIOCGIWSPY,		iw_handler_get_spy),
 	IW_HANDLER(SIOCSIWTHRSPY,	iw_handler_set_thrspy),
 	IW_HANDLER(SIOCGIWTHRSPY,	iw_handler_get_thrspy),
 	IW_HANDLER(SIOCSIWAP,		orinoco_ioctl_setwap),
 	IW_HANDLER(SIOCGIWAP,		orinoco_ioctl_getwap),
-	IW_HANDLER(SIOCSIWSCAN,		(iw_handler)cfg80211_wext_siwscan),
-	IW_HANDLER(SIOCGIWSCAN,		(iw_handler)cfg80211_wext_giwscan),
+	IW_HANDLER(SIOCSIWSCAN,		cfg80211_wext_siwscan),
+	IW_HANDLER(SIOCGIWSCAN,		cfg80211_wext_giwscan),
 	IW_HANDLER(SIOCSIWESSID,	orinoco_ioctl_setessid),
 	IW_HANDLER(SIOCGIWESSID,	orinoco_ioctl_getessid),
 	IW_HANDLER(SIOCSIWRATE,		orinoco_ioctl_setrate),
 	IW_HANDLER(SIOCGIWRATE,		orinoco_ioctl_getrate),
-	IW_HANDLER(SIOCSIWRTS,		(iw_handler)cfg80211_wext_siwrts),
-	IW_HANDLER(SIOCGIWRTS,		(iw_handler)cfg80211_wext_giwrts),
-	IW_HANDLER(SIOCSIWFRAG,		(iw_handler)cfg80211_wext_siwfrag),
-	IW_HANDLER(SIOCGIWFRAG,		(iw_handler)cfg80211_wext_giwfrag),
-	IW_HANDLER(SIOCGIWRETRY,	(iw_handler)cfg80211_wext_giwretry),
+	IW_HANDLER(SIOCSIWRTS,		cfg80211_wext_siwrts),
+	IW_HANDLER(SIOCGIWRTS,		cfg80211_wext_giwrts),
+	IW_HANDLER(SIOCSIWFRAG,		cfg80211_wext_siwfrag),
+	IW_HANDLER(SIOCGIWFRAG,		cfg80211_wext_giwfrag),
+	IW_HANDLER(SIOCGIWRETRY,	cfg80211_wext_giwretry),
 	IW_HANDLER(SIOCSIWENCODE,	orinoco_ioctl_setiwencode),
 	IW_HANDLER(SIOCGIWENCODE,	orinoco_ioctl_getiwencode),
 	IW_HANDLER(SIOCSIWPOWER,	orinoco_ioctl_setpower),
diff --git a/include/net/cfg80211-wext.h b/include/net/cfg80211-wext.h
index ad77caf2ffde..0ee36d97e068 100644
--- a/include/net/cfg80211-wext.h
+++ b/include/net/cfg80211-wext.h
@@ -19,34 +19,34 @@ 
  */
 int cfg80211_wext_giwname(struct net_device *dev,
 			  struct iw_request_info *info,
-			  char *name, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwscan(struct net_device *dev,
 			  struct iw_request_info *info,
 			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwscan(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwrange(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra);
+			   union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra);
+			 union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra);
+			 union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwretry(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_param *retry, char *extra);
+			   union iwreq_data *wrqu, char *extra);
 
 #endif /* __NET_CFG80211_WEXT_H */
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 806a5f1330ff..853619bc0f1a 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -3229,8 +3229,9 @@  static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
 
 int cfg80211_wext_giwscan(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *data = &wrqu->data;
 	struct cfg80211_registered_device *rdev;
 	int res;
 
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index ddf340bfa07a..b5274859ccfd 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -25,16 +25,17 @@ 
 
 int cfg80211_wext_giwname(struct net_device *dev,
 			  struct iw_request_info *info,
-			  char *name, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
-	strcpy(name, "IEEE 802.11");
+	strcpy(wrqu->name, "IEEE 802.11");
 	return 0;
 }
 EXPORT_WEXT_HANDLER(cfg80211_wext_giwname);
 
 int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	__u32 *mode = &wrqu->mode;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev;
 	struct vif_params vifparams;
@@ -71,8 +72,9 @@  int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
 EXPORT_WEXT_HANDLER(cfg80211_wext_siwmode);
 
 int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	__u32 *mode = &wrqu->mode;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	if (!wdev)
@@ -108,8 +110,9 @@  EXPORT_WEXT_HANDLER(cfg80211_wext_giwmode);
 
 int cfg80211_wext_giwrange(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra)
+			   union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct iw_range *range = (struct iw_range *) extra;
 	enum nl80211_band band;
@@ -251,8 +254,9 @@  int cfg80211_wext_freq(struct iw_freq *freq)
 
 int cfg80211_wext_siwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra)
+			 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rts = &wrqu->rts;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u32 orts = wdev->wiphy->rts_threshold;
@@ -281,8 +285,9 @@  EXPORT_WEXT_HANDLER(cfg80211_wext_siwrts);
 
 int cfg80211_wext_giwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra)
+			 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rts = &wrqu->rts;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	rts->value = wdev->wiphy->rts_threshold;
@@ -295,8 +300,9 @@  EXPORT_WEXT_HANDLER(cfg80211_wext_giwrts);
 
 int cfg80211_wext_siwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *frag = &wrqu->frag;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u32 ofrag = wdev->wiphy->frag_threshold;
@@ -325,8 +331,9 @@  EXPORT_WEXT_HANDLER(cfg80211_wext_siwfrag);
 
 int cfg80211_wext_giwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *frag = &wrqu->frag;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	frag->value = wdev->wiphy->frag_threshold;
@@ -339,8 +346,9 @@  EXPORT_WEXT_HANDLER(cfg80211_wext_giwfrag);
 
 static int cfg80211_wext_siwretry(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_param *retry, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *retry = &wrqu->retry;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u32 changed = 0;
@@ -378,8 +386,9 @@  static int cfg80211_wext_siwretry(struct net_device *dev,
 
 int cfg80211_wext_giwretry(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_param *retry, char *extra)
+			   union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *retry = &wrqu->retry;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	retry->disabled = 0;
@@ -588,8 +597,9 @@  static int cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
 
 static int cfg80211_wext_siwencode(struct net_device *dev,
 				   struct iw_request_info *info,
-				   struct iw_point *erq, char *keybuf)
+				   union iwreq_data *wrqu, char *keybuf)
 {
+	struct iw_point *erq = &wrqu->encoding;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int idx, err;
@@ -664,8 +674,9 @@  static int cfg80211_wext_siwencode(struct net_device *dev,
 
 static int cfg80211_wext_siwencodeext(struct net_device *dev,
 				      struct iw_request_info *info,
-				      struct iw_point *erq, char *extra)
+				      union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *erq = &wrqu->encoding;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct iw_encode_ext *ext = (struct iw_encode_ext *) extra;
@@ -767,8 +778,9 @@  static int cfg80211_wext_siwencodeext(struct net_device *dev,
 
 static int cfg80211_wext_giwencode(struct net_device *dev,
 				   struct iw_request_info *info,
-				   struct iw_point *erq, char *keybuf)
+				   union iwreq_data *wrqu, char *keybuf)
 {
+	struct iw_point *erq = &wrqu->encoding;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	int idx;
 
@@ -804,8 +816,9 @@  static int cfg80211_wext_giwencode(struct net_device *dev,
 
 static int cfg80211_wext_siwfreq(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_freq *wextfreq, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_freq *wextfreq = &wrqu->freq;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_chan_def chandef = {
@@ -870,8 +883,9 @@  static int cfg80211_wext_siwfreq(struct net_device *dev,
 
 static int cfg80211_wext_giwfreq(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_freq *freq, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_freq *freq = &wrqu->freq;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_chan_def chandef = {};
@@ -1147,8 +1161,9 @@  static int cfg80211_set_key_mgt(struct wireless_dev *wdev, u32 key_mgt)
 
 static int cfg80211_wext_siwauth(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *data, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *data = &wrqu->param;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	if (wdev->iftype != NL80211_IFTYPE_STATION)
@@ -1180,7 +1195,7 @@  static int cfg80211_wext_siwauth(struct net_device *dev,
 
 static int cfg80211_wext_giwauth(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *data, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
 	/* XXX: what do we need? */
 
@@ -1189,8 +1204,9 @@  static int cfg80211_wext_giwauth(struct net_device *dev,
 
 static int cfg80211_wext_siwpower(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_param *wrq, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *wrq = &wrqu->power;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	bool ps;
@@ -1238,8 +1254,9 @@  static int cfg80211_wext_siwpower(struct net_device *dev,
 
 static int cfg80211_wext_giwpower(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_param *wrq, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *wrq = &wrqu->power;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	wrq->disabled = !wdev->ps;
@@ -1249,8 +1266,9 @@  static int cfg80211_wext_giwpower(struct net_device *dev,
 
 static int cfg80211_wext_siwrate(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *rate, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rate = &wrqu->bitrate;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_bitrate_mask mask;
@@ -1307,8 +1325,9 @@  static int cfg80211_wext_siwrate(struct net_device *dev,
 
 static int cfg80211_wext_giwrate(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *rate, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rate = &wrqu->bitrate;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct station_info sinfo = {};
@@ -1430,8 +1449,9 @@  static struct iw_statistics *cfg80211_wireless_stats(struct net_device *dev)
 
 static int cfg80211_wext_siwap(struct net_device *dev,
 			       struct iw_request_info *info,
-			       struct sockaddr *ap_addr, char *extra)
+			       union iwreq_data *wrqu, char *extra)
 {
+	struct sockaddr *ap_addr = &wrqu->ap_addr;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1455,8 +1475,9 @@  static int cfg80211_wext_siwap(struct net_device *dev,
 
 static int cfg80211_wext_giwap(struct net_device *dev,
 			       struct iw_request_info *info,
-			       struct sockaddr *ap_addr, char *extra)
+			       union iwreq_data *wrqu, char *extra)
 {
+	struct sockaddr *ap_addr = &wrqu->ap_addr;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1480,8 +1501,9 @@  static int cfg80211_wext_giwap(struct net_device *dev,
 
 static int cfg80211_wext_siwessid(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_point *data, char *ssid)
+				  union iwreq_data *wrqu, char *ssid)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1505,8 +1527,9 @@  static int cfg80211_wext_siwessid(struct net_device *dev,
 
 static int cfg80211_wext_giwessid(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_point *data, char *ssid)
+				  union iwreq_data *wrqu, char *ssid)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1533,7 +1556,7 @@  static int cfg80211_wext_giwessid(struct net_device *dev,
 
 static int cfg80211_wext_siwpmksa(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_point *data, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
@@ -1584,78 +1607,39 @@  static int cfg80211_wext_siwpmksa(struct net_device *dev,
 	return ret;
 }
 
-#define DEFINE_WEXT_COMPAT_STUB(func, type)			\
-	static int __ ## func(struct net_device *dev,		\
-			      struct iw_request_info *info,	\
-			      union iwreq_data *wrqu,		\
-			      char *extra)			\
-	{							\
-		return func(dev, info, (type *)wrqu, extra);	\
-	}
-
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwname, char)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwfreq, struct iw_freq)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwfreq, struct iw_freq)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwmode, u32)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwmode, u32)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrange, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwap, struct sockaddr)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwap, struct sockaddr)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwmlme, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwscan, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwessid, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwessid, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwrate, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrate, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwrts, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrts, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwfrag, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwfrag, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwretry, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwretry, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwencode, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwencode, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwpower, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwpower, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwgenie, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwauth, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwauth, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwencodeext, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwpmksa, struct iw_point)
-
 static const iw_handler cfg80211_handlers[] = {
-	[IW_IOCTL_IDX(SIOCGIWNAME)]	= __cfg80211_wext_giwname,
-	[IW_IOCTL_IDX(SIOCSIWFREQ)]	= __cfg80211_wext_siwfreq,
-	[IW_IOCTL_IDX(SIOCGIWFREQ)]	= __cfg80211_wext_giwfreq,
-	[IW_IOCTL_IDX(SIOCSIWMODE)]	= __cfg80211_wext_siwmode,
-	[IW_IOCTL_IDX(SIOCGIWMODE)]	= __cfg80211_wext_giwmode,
-	[IW_IOCTL_IDX(SIOCGIWRANGE)]	= __cfg80211_wext_giwrange,
-	[IW_IOCTL_IDX(SIOCSIWAP)]	= __cfg80211_wext_siwap,
-	[IW_IOCTL_IDX(SIOCGIWAP)]	= __cfg80211_wext_giwap,
-	[IW_IOCTL_IDX(SIOCSIWMLME)]	= __cfg80211_wext_siwmlme,
-	[IW_IOCTL_IDX(SIOCSIWSCAN)]	= cfg80211_wext_siwscan,
-	[IW_IOCTL_IDX(SIOCGIWSCAN)]	= __cfg80211_wext_giwscan,
-	[IW_IOCTL_IDX(SIOCSIWESSID)]	= __cfg80211_wext_siwessid,
-	[IW_IOCTL_IDX(SIOCGIWESSID)]	= __cfg80211_wext_giwessid,
-	[IW_IOCTL_IDX(SIOCSIWRATE)]	= __cfg80211_wext_siwrate,
-	[IW_IOCTL_IDX(SIOCGIWRATE)]	= __cfg80211_wext_giwrate,
-	[IW_IOCTL_IDX(SIOCSIWRTS)]	= __cfg80211_wext_siwrts,
-	[IW_IOCTL_IDX(SIOCGIWRTS)]	= __cfg80211_wext_giwrts,
-	[IW_IOCTL_IDX(SIOCSIWFRAG)]	= __cfg80211_wext_siwfrag,
-	[IW_IOCTL_IDX(SIOCGIWFRAG)]	= __cfg80211_wext_giwfrag,
-	[IW_IOCTL_IDX(SIOCSIWTXPOW)]	= cfg80211_wext_siwtxpower,
-	[IW_IOCTL_IDX(SIOCGIWTXPOW)]	= cfg80211_wext_giwtxpower,
-	[IW_IOCTL_IDX(SIOCSIWRETRY)]	= __cfg80211_wext_siwretry,
-	[IW_IOCTL_IDX(SIOCGIWRETRY)]	= __cfg80211_wext_giwretry,
-	[IW_IOCTL_IDX(SIOCSIWENCODE)]	= __cfg80211_wext_siwencode,
-	[IW_IOCTL_IDX(SIOCGIWENCODE)]	= __cfg80211_wext_giwencode,
-	[IW_IOCTL_IDX(SIOCSIWPOWER)]	= __cfg80211_wext_siwpower,
-	[IW_IOCTL_IDX(SIOCGIWPOWER)]	= __cfg80211_wext_giwpower,
-	[IW_IOCTL_IDX(SIOCSIWGENIE)]	= __cfg80211_wext_siwgenie,
-	[IW_IOCTL_IDX(SIOCSIWAUTH)]	= __cfg80211_wext_siwauth,
-	[IW_IOCTL_IDX(SIOCGIWAUTH)]	= __cfg80211_wext_giwauth,
-	[IW_IOCTL_IDX(SIOCSIWENCODEEXT)]= __cfg80211_wext_siwencodeext,
-	[IW_IOCTL_IDX(SIOCSIWPMKSA)]	= __cfg80211_wext_siwpmksa,
+	[IW_IOCTL_IDX(SIOCGIWNAME)]     = cfg80211_wext_giwname,
+	[IW_IOCTL_IDX(SIOCSIWFREQ)]     = cfg80211_wext_siwfreq,
+	[IW_IOCTL_IDX(SIOCGIWFREQ)]     = cfg80211_wext_giwfreq,
+	[IW_IOCTL_IDX(SIOCSIWMODE)]     = cfg80211_wext_siwmode,
+	[IW_IOCTL_IDX(SIOCGIWMODE)]     = cfg80211_wext_giwmode,
+	[IW_IOCTL_IDX(SIOCGIWRANGE)]    = cfg80211_wext_giwrange,
+	[IW_IOCTL_IDX(SIOCSIWAP)]       = cfg80211_wext_siwap,
+	[IW_IOCTL_IDX(SIOCGIWAP)]       = cfg80211_wext_giwap,
+	[IW_IOCTL_IDX(SIOCSIWMLME)]     = cfg80211_wext_siwmlme,
+	[IW_IOCTL_IDX(SIOCSIWSCAN)]     = cfg80211_wext_siwscan,
+	[IW_IOCTL_IDX(SIOCGIWSCAN)]     = cfg80211_wext_giwscan,
+	[IW_IOCTL_IDX(SIOCSIWESSID)]    = cfg80211_wext_siwessid,
+	[IW_IOCTL_IDX(SIOCGIWESSID)]    = cfg80211_wext_giwessid,
+	[IW_IOCTL_IDX(SIOCSIWRATE)]     = cfg80211_wext_siwrate,
+	[IW_IOCTL_IDX(SIOCGIWRATE)]     = cfg80211_wext_giwrate,
+	[IW_IOCTL_IDX(SIOCSIWRTS)]      = cfg80211_wext_siwrts,
+	[IW_IOCTL_IDX(SIOCGIWRTS)]      = cfg80211_wext_giwrts,
+	[IW_IOCTL_IDX(SIOCSIWFRAG)]     = cfg80211_wext_siwfrag,
+	[IW_IOCTL_IDX(SIOCGIWFRAG)]     = cfg80211_wext_giwfrag,
+	[IW_IOCTL_IDX(SIOCSIWTXPOW)]    = cfg80211_wext_siwtxpower,
+	[IW_IOCTL_IDX(SIOCGIWTXPOW)]    = cfg80211_wext_giwtxpower,
+	[IW_IOCTL_IDX(SIOCSIWRETRY)]    = cfg80211_wext_siwretry,
+	[IW_IOCTL_IDX(SIOCGIWRETRY)]    = cfg80211_wext_giwretry,
+	[IW_IOCTL_IDX(SIOCSIWENCODE)]   = cfg80211_wext_siwencode,
+	[IW_IOCTL_IDX(SIOCGIWENCODE)]   = cfg80211_wext_giwencode,
+	[IW_IOCTL_IDX(SIOCSIWPOWER)]    = cfg80211_wext_siwpower,
+	[IW_IOCTL_IDX(SIOCGIWPOWER)]    = cfg80211_wext_giwpower,
+	[IW_IOCTL_IDX(SIOCSIWGENIE)]    = cfg80211_wext_siwgenie,
+	[IW_IOCTL_IDX(SIOCSIWAUTH)]     = cfg80211_wext_siwauth,
+	[IW_IOCTL_IDX(SIOCGIWAUTH)]     = cfg80211_wext_giwauth,
+	[IW_IOCTL_IDX(SIOCSIWENCODEEXT)]= cfg80211_wext_siwencodeext,
+	[IW_IOCTL_IDX(SIOCSIWPMKSA)]    = cfg80211_wext_siwpmksa,
 };
 
 const struct iw_handler_def cfg80211_wext_handler = {
diff --git a/net/wireless/wext-compat.h b/net/wireless/wext-compat.h
index 8d3cc1552e2f..c02eb789e676 100644
--- a/net/wireless/wext-compat.h
+++ b/net/wireless/wext-compat.h
@@ -13,7 +13,7 @@ 
 
 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 			       struct iw_request_info *info,
-			       struct iw_freq *freq, char *extra);
+			       struct iw_freq *wextfreq, char *extra);
 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 			       struct iw_request_info *info,
 			       struct iw_freq *freq, char *extra);
@@ -32,7 +32,7 @@  int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 
 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
 			      struct iw_request_info *info,
-			      struct iw_freq *freq, char *extra);
+			      struct iw_freq *wextfreq, char *extra);
 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 			      struct iw_request_info *info,
 			      struct iw_freq *freq, char *extra);
@@ -51,10 +51,10 @@  int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 
 int cfg80211_wext_siwmlme(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwgenie(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra);
+			   union iwreq_data *wrqu, char *extra);
 
 
 int cfg80211_wext_freq(struct iw_freq *freq);
diff --git a/net/wireless/wext-sme.c b/net/wireless/wext-sme.c
index 68f45afc352d..191c6d98c700 100644
--- a/net/wireless/wext-sme.c
+++ b/net/wireless/wext-sme.c
@@ -324,8 +324,9 @@  int cfg80211_mgd_wext_giwap(struct net_device *dev,
 
 int cfg80211_wext_siwgenie(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra)
+			   union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u8 *ie = extra;
@@ -374,7 +375,7 @@  int cfg80211_wext_siwgenie(struct net_device *dev,
 
 int cfg80211_wext_siwmlme(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct iw_mlme *mlme = (struct iw_mlme *)extra;