[PATCH] WE-20 for kernel 2.6.16

	This is version 20 of the Wireless Extensions. This is the
completion of the RtNetlink work I started early 2004, it enables the
full Wireless Extension API over RtNetlink.

	Few comments on the patch :
	o totally driver transparent, no change in drivers needed.
	o iwevent were already RtNetlink based since they were created
(around 2.5.7). This adds all the regular SET and GET requests over
RtNetlink, using the exact same mechanism and data format as iwevents.
	o This is a Kconfig option, as currently most people have no
need for it. Surprisingly, patch is actually small and well
encapsulated.
	o Tested on SMP, attention as been paid to make it 64 bits clean.
	o Code do probably too many checks and could be further
optimised, but better safe than sorry.
	o RtNetlink based version of the Wireless Tools available on
my web page for people inclined to try out this stuff.

	I would also like to thank Alexey Kuznetsov for his helpful
suggestions to make this patch better.

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/Kconfig

@@ -25,6 +25,15 @@ config NET_RADIO
 	  the tools from
 	  <http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html>.
 
+config NET_WIRELESS_RTNETLINK
+	bool "Wireless Extension API over RtNetlink"
+	---help---
+	  Support the Wireless Extension API over the RtNetlink socket
+	  in addition to the traditional ioctl interface (selected above).
+
+	  For now, few tools use this facility, but it might grow in the
+	  future. The only downside is that it adds 4.5 kB to your kernel.
+
 # Note : the cards are obsolete (can't buy them anymore), but the drivers
 # are not, as people are still using them...
 comment "Obsolete Wireless cards support (pre-802.11)"

include/linux/wireless.h

@@ -1,10 +1,10 @@
 /*
  * This file define a set of standard wireless extensions
  *
- * Version :	19	18.3.05
+ * Version :	20	17.2.06
  *
  * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
- * Copyright (c) 1997-2005 Jean Tourrilhes, All Rights Reserved.
+ * Copyright (c) 1997-2006 Jean Tourrilhes, All Rights Reserved.
  */
 
 #ifndef _LINUX_WIRELESS_H
@@ -80,7 +80,7 @@
  * (there is some stuff that will be added in the future...)
  * I just plan to increment with each new version.
  */
-#define WIRELESS_EXT	19
+#define WIRELESS_EXT	20
 
 /*
  * Changes :
@@ -204,6 +204,10 @@
  *	- Add IW_QUAL_ALL_UPDATED and IW_QUAL_ALL_INVALID macros
  *	- Add explicit flag to tell stats are in dBm : IW_QUAL_DBM
  *	- Add IW_IOCTL_IDX() and IW_EVENT_IDX() macros
+ *
+ * V19 to V20
+ * ----------
+ *	- RtNetlink requests support (SET/GET)
  */
 
 /**************************** CONSTANTS ****************************/

include/net/iw_handler.h

@@ -4,7 +4,7 @@
  * Version :	7	18.3.05
  *
  * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
- * Copyright (c) 2001-2005 Jean Tourrilhes, All Rights Reserved.
+ * Copyright (c) 2001-2006 Jean Tourrilhes, All Rights Reserved.
  */
 
 #ifndef _IW_HANDLER_H
@@ -436,6 +436,16 @@ extern int dev_get_wireless_info(char * buffer, char **start, off_t offset,
 /* Handle IOCTLs, called in net/core/dev.c */
 extern int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd);
 
+/* Handle RtNetlink requests, called in net/core/rtnetlink.c */
+extern int wireless_rtnetlink_set(struct net_device *	dev,
+				  char *		data,
+				  int			len);
+extern int wireless_rtnetlink_get(struct net_device *	dev,
+				  char *		data,
+				  int			len,
+				  char **		p_buf,
+				  int *			p_len);
+
 /* Second : functions that may be called by driver modules */
 
 /* Send a single event to user space */

net/core/rtnetlink.c

@@ -51,6 +51,10 @@
 #include <net/sock.h>
 #include <net/pkt_sched.h>
 #include <net/netlink.h>
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+#include <linux/wireless.h>
+#include <net/iw_handler.h>
+#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
 
 static DEFINE_MUTEX(rtnl_mutex);
 
@@ -467,6 +471,17 @@ static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 			goto out;
 	}
 
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+	if (ida[IFLA_WIRELESS - 1]) {
+
+		/* Call Wireless Extensions.
+		 * Various stuff checked in there... */
+		err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
+		if (err)
+			goto out;
+	}
+#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
+
 	err = 0;
 
 out:
@@ -477,6 +492,83 @@ out:
 	return err;
 }
 
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
+{
+	struct ifinfomsg  *ifm = NLMSG_DATA(in_nlh);
+	struct rtattr    **ida = arg;
+	struct net_device *dev;
+	struct ifinfomsg *r;
+	struct nlmsghdr  *nlh;
+	int err = -ENOBUFS;
+	struct sk_buff *skb;
+	unsigned char	 *b;
+	char *iw_buf = NULL;
+	int iw_buf_len = 0;
+
+	if (ifm->ifi_index >= 0)
+		dev = dev_get_by_index(ifm->ifi_index);
+	else
+		return -EINVAL;
+	if (!dev)
+		return -ENODEV;
+
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+	if (ida[IFLA_WIRELESS - 1]) {
+
+		/* Call Wireless Extensions. We need to know the size before
+		 * we can alloc. Various stuff checked in there... */
+		err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len);
+		if (err)
+			goto out;
+	}
+#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
+
+	/* Create a skb big enough to include all the data.
+	 * Some requests are way bigger than 4k... Jean II */
+	skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)),
+			GFP_KERNEL);
+	if (!skb)
+		goto out;
+	b = skb->tail;
+
+	/* Put in the message the usual good stuff */
+	nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq,
+			RTM_NEWLINK, sizeof(*r));
+	r = NLMSG_DATA(nlh);
+	r->ifi_family = AF_UNSPEC;
+	r->__ifi_pad = 0;
+	r->ifi_type = dev->type;
+	r->ifi_index = dev->ifindex;
+	r->ifi_flags = dev->flags;
+	r->ifi_change = 0;
+
+	/* Put the wireless payload if it exist */
+	if(iw_buf != NULL)
+		RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
+			iw_buf + IW_EV_POINT_OFF);
+
+	nlh->nlmsg_len = skb->tail - b;
+
+	/* Needed ? */
+	NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
+
+	err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
+	if (err > 0)
+		err = 0;
+out:
+	if(iw_buf != NULL)
+		kfree(iw_buf);
+	dev_put(dev);
+	return err;
+
+rtattr_failure:
+nlmsg_failure:
+	kfree_skb(skb);
+	goto out;
+}
+#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
+
 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	int idx;
@@ -642,7 +734,11 @@ static void rtnetlink_rcv(struct sock *sk, int len)
 
 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 {
-	[RTM_GETLINK     - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
+	[RTM_GETLINK     - RTM_BASE] = {
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+					 .doit   = do_getlink,
+#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
+					 .dumpit = rtnetlink_dump_ifinfo },
 	[RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink		 },
 	[RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all	 },
 	[RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all	 },

net/core/wireless.c

@@ -2,7 +2,7 @@
  * This file implement the Wireless Extensions APIs.
  *
  * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
- * Copyright (c) 1997-2005 Jean Tourrilhes, All Rights Reserved.
+ * Copyright (c) 1997-2006 Jean Tourrilhes, All Rights Reserved.
  *
  * (As all part of the Linux kernel, this file is GPL)
  */
@@ -65,6 +65,9 @@
  *	o Start deprecating dev->get_wireless_stats, output a warning
  *	o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
  *	o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
+ *
+ * v8 - 17.02.06 - Jean II
+ *	o RtNetlink requests support (SET/GET)
  */
 
 /***************************** INCLUDES *****************************/
@@ -89,11 +92,13 @@
 
 /* Debugging stuff */
 #undef WE_IOCTL_DEBUG		/* Debug IOCTL API */
+#undef WE_RTNETLINK_DEBUG	/* Debug RtNetlink API */
 #undef WE_EVENT_DEBUG		/* Debug Event dispatcher */
 #undef WE_SPY_DEBUG		/* Debug enhanced spy support */
 
 /* Options */
-#define WE_EVENT_NETLINK	/* Propagate events using rtnetlink */
+//CONFIG_NET_WIRELESS_RTNETLINK	/* Wireless requests over RtNetlink */
+#define WE_EVENT_RTNETLINK	/* Propagate events using RtNetlink */
 #define WE_SET_EVENT		/* Generate an event on some set commands */
 
 /************************* GLOBAL VARIABLES *************************/
@@ -156,13 +161,18 @@ static const struct iw_ioctl_description standard_ioctl[] = {
 		.header_type	= IW_HEADER_TYPE_NULL,
 	},
 	[SIOCGIWPRIV	- SIOCIWFIRST] = { /* (handled directly by us) */
-		.header_type	= IW_HEADER_TYPE_NULL,
+		.header_type	= IW_HEADER_TYPE_POINT,
+		.token_size	= sizeof(struct iw_priv_args),
+		.max_tokens	= 16,
+		.flags		= IW_DESCR_FLAG_NOMAX,
 	},
 	[SIOCSIWSTATS	- SIOCIWFIRST] = {
 		.header_type	= IW_HEADER_TYPE_NULL,
 	},
 	[SIOCGIWSTATS	- SIOCIWFIRST] = { /* (handled directly by us) */
-		.header_type	= IW_HEADER_TYPE_NULL,
+		.header_type	= IW_HEADER_TYPE_POINT,
+		.token_size	= 1,
+		.max_tokens	= sizeof(struct iw_statistics),
 		.flags		= IW_DESCR_FLAG_DUMP,
 	},
 	[SIOCSIWSPY	- SIOCIWFIRST] = {
@@ -529,6 +539,70 @@ static inline int adjust_priv_size(__u16		args,
 	return num * iw_priv_type_size[type];
 }
 
+/* ---------------------------------------------------------------- */
+/*
+ * Standard Wireless Handler : get wireless stats
+ *	Allow programatic access to /proc/net/wireless even if /proc
+ *	doesn't exist... Also more efficient...
+ */
+static int iw_handler_get_iwstats(struct net_device *		dev,
+				  struct iw_request_info *	info,
+				  union iwreq_data *		wrqu,
+				  char *			extra)
+{
+	/* Get stats from the driver */
+	struct iw_statistics *stats;
+
+	stats = get_wireless_stats(dev);
+	if (stats != (struct iw_statistics *) NULL) {
+
+		/* Copy statistics to extra */
+		memcpy(extra, stats, sizeof(struct iw_statistics));
+		wrqu->data.length = sizeof(struct iw_statistics);
+
+		/* Check if we need to clear the updated flag */
+		if(wrqu->data.flags != 0)
+			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
+		return 0;
+	} else
+		return -EOPNOTSUPP;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Standard Wireless Handler : get iwpriv definitions
+ * Export the driver private handler definition
+ * They will be picked up by tools like iwpriv...
+ */
+static int iw_handler_get_private(struct net_device *		dev,
+				  struct iw_request_info *	info,
+				  union iwreq_data *		wrqu,
+				  char *			extra)
+{
+	/* Check if the driver has something to export */
+	if((dev->wireless_handlers->num_private_args == 0) ||
+	   (dev->wireless_handlers->private_args == NULL))
+		return -EOPNOTSUPP;
+
+	/* Check if there is enough buffer up there */
+	if(wrqu->data.length < dev->wireless_handlers->num_private_args) {
+		/* User space can't know in advance how large the buffer
+		 * needs to be. Give it a hint, so that we can support
+		 * any size buffer we want somewhat efficiently... */
+		wrqu->data.length = dev->wireless_handlers->num_private_args;
+		return -E2BIG;
+	}
+
+	/* Set the number of available ioctls. */
+	wrqu->data.length = dev->wireless_handlers->num_private_args;
+
+	/* Copy structure to the user buffer. */
+	memcpy(extra, dev->wireless_handlers->private_args,
+	       sizeof(struct iw_priv_args) * wrqu->data.length);
+
+	return 0;
+}
+
 
 /******************** /proc/net/wireless SUPPORT ********************/
 /*
@@ -628,83 +702,16 @@ int __init wireless_proc_init(void)
  * or just call the driver ioctl handler.
  */
 
-/* ---------------------------------------------------------------- */
-/*
- *	Allow programatic access to /proc/net/wireless even if /proc
- *	doesn't exist... Also more efficient...
- */
-static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
-{
-	/* Get stats from the driver */
-	struct iw_statistics *stats;
-
-	stats = get_wireless_stats(dev);
-	if (stats != (struct iw_statistics *) NULL) {
-		struct iwreq *	wrq = (struct iwreq *)ifr;
-
-		/* Copy statistics to the user buffer */
-		if(copy_to_user(wrq->u.data.pointer, stats,
-				sizeof(struct iw_statistics)))
-			return -EFAULT;
-
-		/* Check if we need to clear the updated flag */
-		if(wrq->u.data.flags != 0)
-			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
-		return 0;
-	} else
-		return -EOPNOTSUPP;
-}
-
-/* ---------------------------------------------------------------- */
-/*
- * Export the driver private handler definition
- * They will be picked up by tools like iwpriv...
- */
-static inline int ioctl_export_private(struct net_device *	dev,
-				       struct ifreq *		ifr)
-{
-	struct iwreq *				iwr = (struct iwreq *) ifr;
-
-	/* Check if the driver has something to export */
-	if((dev->wireless_handlers->num_private_args == 0) ||
-	   (dev->wireless_handlers->private_args == NULL))
-		return -EOPNOTSUPP;
-
-	/* Check NULL pointer */
-	if(iwr->u.data.pointer == NULL)
-		return -EFAULT;
-
-	/* Check if there is enough buffer up there */
-	if(iwr->u.data.length < dev->wireless_handlers->num_private_args) {
-		/* User space can't know in advance how large the buffer
-		 * needs to be. Give it a hint, so that we can support
-		 * any size buffer we want somewhat efficiently... */
-		iwr->u.data.length = dev->wireless_handlers->num_private_args;
-		return -E2BIG;
-	}
-
-	/* Set the number of available ioctls. */
-	iwr->u.data.length = dev->wireless_handlers->num_private_args;
-
-	/* Copy structure to the user buffer. */
-	if (copy_to_user(iwr->u.data.pointer,
-			 dev->wireless_handlers->private_args,
-			 sizeof(struct iw_priv_args) * iwr->u.data.length))
-		return -EFAULT;
-
-	return 0;
-}
-
 /* ---------------------------------------------------------------- */
 /*
  * Wrapper to call a standard Wireless Extension handler.
  * We do various checks and also take care of moving data between
  * user space and kernel space.
  */
-static inline int ioctl_standard_call(struct net_device *	dev,
-				      struct ifreq *		ifr,
-				      unsigned int		cmd,
-				      iw_handler		handler)
+static int ioctl_standard_call(struct net_device *	dev,
+			       struct ifreq *		ifr,
+			       unsigned int		cmd,
+			       iw_handler		handler)
 {
 	struct iwreq *				iwr = (struct iwreq *) ifr;
 	const struct iw_ioctl_description *	descr;
@@ -1048,14 +1055,20 @@ int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
 	{
 		case SIOCGIWSTATS:
 			/* Get Wireless Stats */
-			return dev_iwstats(dev, ifr);
+			return ioctl_standard_call(dev,
+						   ifr,
+						   cmd,
+						   &iw_handler_get_iwstats);
 
 		case SIOCGIWPRIV:
 			/* Check if we have some wireless handlers defined */
 			if(dev->wireless_handlers != NULL) {
 				/* We export to user space the definition of
 				 * the private handler ourselves */
-				return ioctl_export_private(dev, ifr);
+				return ioctl_standard_call(dev,
+							   ifr,
+							   cmd,
+							   &iw_handler_get_private);
 			}
 			// ## Fall-through for old API ##
 		default:
@@ -1088,16 +1101,739 @@ int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
 	return -EINVAL;
 }
 
+/********************** RTNETLINK REQUEST API **********************/
+/*
+ * The alternate user space API to configure all those Wireless Extensions
+ * is through RtNetlink.
+ * This API support only the new driver API (iw_handler).
+ *
+ * This RtNetlink API use the same query/reply model as the ioctl API.
+ * Maximum effort has been done to fit in the RtNetlink model, and
+ * we support both RtNetlink Set and RtNelink Get operations.
+ * On the other hand, we don't offer Dump operations because of the
+ * following reasons :
+ *	o Large number of parameters, most optional
+ *	o Large size of some parameters (> 100 bytes)
+ *	o Each parameters need to be extracted from hardware
+ *	o Scan requests can take seconds and disable network activity.
+ * Because of this high cost/overhead, we want to return only the
+ * parameters the user application is really interested in.
+ * We could offer partial Dump using the IW_DESCR_FLAG_DUMP flag.
+ *
+ * The API uses the standard RtNetlink socket. When the RtNetlink code
+ * find a IFLA_WIRELESS field in a RtNetlink SET_LINK request,
+ * it calls here.
+ */
+
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+/* ---------------------------------------------------------------- */
+/*
+ * Wrapper to call a standard Wireless Extension GET handler.
+ * We do various checks and call the handler with the proper args.
+ */
+static int rtnetlink_standard_get(struct net_device *	dev,
+				  struct iw_event *	request,
+				  int			request_len,
+				  iw_handler		handler,
+				  char **		p_buf,
+				  int *			p_len)
+{
+	const struct iw_ioctl_description *	descr = NULL;
+	unsigned int				cmd;
+	union iwreq_data *			wrqu;
+	int					hdr_len;
+	struct iw_request_info			info;
+	char *					buffer = NULL;
+	int					buffer_size = 0;
+	int					ret = -EINVAL;
+
+	/* Get the description of the Request */
+	cmd = request->cmd;
+	if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
+		return -EOPNOTSUPP;
+	descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
+
+#ifdef WE_RTNETLINK_DEBUG
+	printk(KERN_DEBUG "%s (WE.r) : Found standard handler for 0x%04X\n",
+	       dev->name, cmd);
+	printk(KERN_DEBUG "%s (WE.r) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+	/* Check if wrqu is complete */
+	hdr_len = event_type_size[descr->header_type];
+	if(request_len < hdr_len) {
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG
+		       "%s (WE.r) : Wireless request too short (%d)\n",
+		       dev->name, request_len);
+#endif	/* WE_RTNETLINK_DEBUG */
+		return -EINVAL;
+	}
+
+	/* Prepare the call */
+	info.cmd = cmd;
+	info.flags = 0;
+
+	/* Check if we have extra data in the reply or not */
+	if(descr->header_type != IW_HEADER_TYPE_POINT) {
+
+		/* Create the kernel buffer that we will return.
+		 * It's at an offset to match the TYPE_POINT case... */
+		buffer_size = request_len + IW_EV_POINT_OFF;
+		buffer = kmalloc(buffer_size, GFP_KERNEL);
+		if (buffer == NULL) {
+			return -ENOMEM;
+		}
+		/* Copy event data */
+		memcpy(buffer + IW_EV_POINT_OFF, request, request_len);
+		/* Use our own copy of wrqu */
+		wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF
+					     + IW_EV_LCP_LEN);
+
+		/* No extra arguments. Trivial to handle */
+		ret = handler(dev, &info, wrqu, NULL);
+
+	} else {
+		union iwreq_data	wrqu_point;
+		char *			extra = NULL;
+		int			extra_size = 0;
+
+		/* Get a temp copy of wrqu (skip pointer) */
+		memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
+		       ((char *) request) + IW_EV_LCP_LEN,
+		       IW_EV_POINT_LEN - IW_EV_LCP_LEN);
+
+		/* Calculate space needed by arguments. Always allocate
+		 * for max space. Easier, and won't last long... */
+		extra_size = descr->max_tokens * descr->token_size;
+		/* Support for very large requests */
+		if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
+		   (wrqu_point.data.length > descr->max_tokens))
+			extra_size = (wrqu_point.data.length
+				      * descr->token_size);
+		buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF;
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n",
+		       dev->name, extra_size, buffer_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+		/* Create the kernel buffer that we will return */
+		buffer = kmalloc(buffer_size, GFP_KERNEL);
+		if (buffer == NULL) {
+			return -ENOMEM;
+		}
+
+		/* Put wrqu in the right place (just before extra).
+		 * Leave space for IWE header and dummy pointer...
+		 * Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned...
+		 */
+		memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
+		       ((char *) &wrqu_point) + IW_EV_POINT_OFF,
+		       IW_EV_POINT_LEN - IW_EV_LCP_LEN);
+		wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN);
+
+		/* Extra comes logically after that. Offset +12 bytes. */
+		extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN;
+
+		/* Call the handler */
+		ret = handler(dev, &info, wrqu, extra);
+
+		/* Calculate real returned length */
+		extra_size = (wrqu->data.length * descr->token_size);
+		/* Re-adjust reply size */
+		request->len = extra_size + IW_EV_POINT_LEN;
+
+		/* Put the iwe header where it should, i.e. scrap the
+		 * dummy pointer. */
+		memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN);
+
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+		/* Check if there is enough buffer up there */
+		if(wrqu_point.data.length < wrqu->data.length)
+			ret = -E2BIG;
+	}
+
+	/* Return the buffer to the caller */
+	if (!ret) {
+		*p_buf = buffer;
+		*p_len = request->len;
+	} else {
+		/* Cleanup */
+		if(buffer)
+			kfree(buffer);
+	}
+
+	return ret;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Wrapper to call a standard Wireless Extension SET handler.
+ * We do various checks and call the handler with the proper args.
+ */
+static inline int rtnetlink_standard_set(struct net_device *	dev,
+					 struct iw_event *	request,
+					 int			request_len,
+					 iw_handler		handler)
+{
+	const struct iw_ioctl_description *	descr = NULL;
+	unsigned int				cmd;
+	union iwreq_data *			wrqu;
+	union iwreq_data			wrqu_point;
+	int					hdr_len;
+	char *					extra = NULL;
+	int					extra_size = 0;
+	struct iw_request_info			info;
+	int					ret = -EINVAL;
+
+	/* Get the description of the Request */
+	cmd = request->cmd;
+	if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
+		return -EOPNOTSUPP;
+	descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
+
+#ifdef WE_RTNETLINK_DEBUG
+	printk(KERN_DEBUG "%s (WE.r) : Found standard SET handler for 0x%04X\n",
+	       dev->name, cmd);
+	printk(KERN_DEBUG "%s (WE.r) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+	/* Extract fixed header from request. This is properly aligned. */
+	wrqu = &request->u;
+
+	/* Check if wrqu is complete */
+	hdr_len = event_type_size[descr->header_type];
+	if(request_len < hdr_len) {
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG
+		       "%s (WE.r) : Wireless request too short (%d)\n",
+		       dev->name, request_len);
+#endif	/* WE_RTNETLINK_DEBUG */
+		return -EINVAL;
+	}
+
+	/* Prepare the call */
+	info.cmd = cmd;
+	info.flags = 0;
+
+	/* Check if we have extra data in the request or not */
+	if(descr->header_type != IW_HEADER_TYPE_POINT) {
+
+		/* No extra arguments. Trivial to handle */
+		ret = handler(dev, &info, wrqu, NULL);
+
+	} else {
+		int	extra_len;
+
+		/* Put wrqu in the right place (skip pointer) */
+		memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
+		       wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN);
+		/* Don't forget about the event code... */
+		wrqu = &wrqu_point;
+
+		/* Check if number of token fits within bounds */
+		if(wrqu_point.data.length > descr->max_tokens)
+			return -E2BIG;
+		if(wrqu_point.data.length < descr->min_tokens)
+			return -EINVAL;
+
+		/* Real length of payload */
+		extra_len = wrqu_point.data.length * descr->token_size;
+
+		/* Check if request is self consistent */
+		if((request_len - hdr_len) < extra_len) {
+#ifdef WE_RTNETLINK_DEBUG
+			printk(KERN_DEBUG "%s (WE.r) : Wireless request data too short (%d)\n",
+			       dev->name, extra_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+			return -EINVAL;
+		}
+
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes\n",
+		       dev->name, extra_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+		/* Always allocate for max space. Easier, and won't last
+		 * long... */
+		extra_size = descr->max_tokens * descr->token_size;
+		extra = kmalloc(extra_size, GFP_KERNEL);
+		if (extra == NULL)
+			return -ENOMEM;
+
+		/* Copy extra in aligned buffer */
+		memcpy(extra, ((char *) request) + hdr_len, extra_len);
+
+		/* Call the handler */
+		ret = handler(dev, &info, &wrqu_point, extra);
+	}
+
+#ifdef WE_SET_EVENT
+	/* Generate an event to notify listeners of the change */
+	if((descr->flags & IW_DESCR_FLAG_EVENT) &&
+	   ((ret == 0) || (ret == -EIWCOMMIT))) {
+		if(descr->flags & IW_DESCR_FLAG_RESTRICT)
+			/* If the event is restricted, don't
+			 * export the payload */
+			wireless_send_event(dev, cmd, wrqu, NULL);
+		else
+			wireless_send_event(dev, cmd, wrqu, extra);
+	}
+#endif	/* WE_SET_EVENT */
+
+	/* Cleanup - I told you it wasn't that long ;-) */
+	if(extra)
+		kfree(extra);
+
+	/* Call commit handler if needed and defined */
+	if(ret == -EIWCOMMIT)
+		ret = call_commit_handler(dev);
+
+	return ret;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Wrapper to call a private Wireless Extension GET handler.
+ * Same as above...
+ * It's not as nice and slimline as the standard wrapper. The cause
+ * is struct iw_priv_args, which was not really designed for the
+ * job we are going here.
+ *
+ * IMPORTANT : This function prevent to set and get data on the same
+ * IOCTL and enforce the SET/GET convention. Not doing it would be
+ * far too hairy...
+ * If you need to set and get data at the same time, please don't use
+ * a iw_handler but process it in your ioctl handler (i.e. use the
+ * old driver API).
+ */
+static inline int rtnetlink_private_get(struct net_device *	dev,
+					struct iw_event *	request,
+					int			request_len,
+					iw_handler		handler,
+					char **			p_buf,
+					int *			p_len)
+{
+	const struct iw_priv_args *	descr = NULL;
+	unsigned int			cmd;
+	union iwreq_data *		wrqu;
+	int				hdr_len;
+	struct iw_request_info		info;
+	int				extra_size = 0;
+	int				i;
+	char *				buffer = NULL;
+	int				buffer_size = 0;
+	int				ret = -EINVAL;
+
+	/* Get the description of the Request */
+	cmd = request->cmd;
+	for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
+		if(cmd == dev->wireless_handlers->private_args[i].cmd) {
+			descr = &(dev->wireless_handlers->private_args[i]);
+			break;
+		}
+	if(descr == NULL)
+		return -EOPNOTSUPP;
+
+#ifdef WE_RTNETLINK_DEBUG
+	printk(KERN_DEBUG "%s (WE.r) : Found private handler for 0x%04X\n",
+	       dev->name, cmd);
+	printk(KERN_DEBUG "%s (WE.r) : Name %s, set %X, get %X\n",
+	       dev->name, descr->name, descr->set_args, descr->get_args);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+	/* Compute the max size of the get arguments */
+	extra_size = get_priv_size(descr->get_args);
+
+	/* Does it fits in wrqu ? */
+	if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
+	   (extra_size <= IFNAMSIZ)) {
+		hdr_len = extra_size;
+		extra_size = 0;
+	} else {
+		hdr_len = IW_EV_POINT_LEN;
+	}
+
+	/* Check if wrqu is complete */
+	if(request_len < hdr_len) {
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG
+		       "%s (WE.r) : Wireless request too short (%d)\n",
+		       dev->name, request_len);
+#endif	/* WE_RTNETLINK_DEBUG */
+		return -EINVAL;
+	}
+
+	/* Prepare the call */
+	info.cmd = cmd;
+	info.flags = 0;
+
+	/* Check if we have a pointer to user space data or not. */
+	if(extra_size == 0) {
+
+		/* Create the kernel buffer that we will return.
+		 * It's at an offset to match the TYPE_POINT case... */
+		buffer_size = request_len + IW_EV_POINT_OFF;
+		buffer = kmalloc(buffer_size, GFP_KERNEL);
+		if (buffer == NULL) {
+			return -ENOMEM;
+		}
+		/* Copy event data */
+		memcpy(buffer + IW_EV_POINT_OFF, request, request_len);
+		/* Use our own copy of wrqu */
+		wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF
+					     + IW_EV_LCP_LEN);
+
+		/* No extra arguments. Trivial to handle */
+		ret = handler(dev, &info, wrqu, (char *) wrqu);
+
+	} else {
+		char *	extra;
+
+		/* Buffer for full reply */
+		buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF;
+
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n",
+		       dev->name, extra_size, buffer_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+		/* Create the kernel buffer that we will return */
+		buffer = kmalloc(buffer_size, GFP_KERNEL);
+		if (buffer == NULL) {
+			return -ENOMEM;
+		}
+
+		/* Put wrqu in the right place (just before extra).
+		 * Leave space for IWE header and dummy pointer...
+		 * Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned...
+		 */
+		memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
+		       ((char *) request) + IW_EV_LCP_LEN,
+		       IW_EV_POINT_LEN - IW_EV_LCP_LEN);
+		wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN);
+
+		/* Extra comes logically after that. Offset +12 bytes. */
+		extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN;
+
+		/* Call the handler */
+		ret = handler(dev, &info, wrqu, extra);
+
+		/* Adjust for the actual length if it's variable,
+		 * avoid leaking kernel bits outside. */
+		if (!(descr->get_args & IW_PRIV_SIZE_FIXED))
+			extra_size = adjust_priv_size(descr->get_args, wrqu);
+		/* Re-adjust reply size */
+		request->len = extra_size + IW_EV_POINT_LEN;
+
+		/* Put the iwe header where it should, i.e. scrap the
+		 * dummy pointer. */
+		memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN);
+
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+	}
+
+	/* Return the buffer to the caller */
+	if (!ret) {
+		*p_buf = buffer;
+		*p_len = request->len;
+	} else {
+		/* Cleanup */
+		if(buffer)
+			kfree(buffer);
+	}
+
+	return ret;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Wrapper to call a private Wireless Extension SET handler.
+ * Same as above...
+ * It's not as nice and slimline as the standard wrapper. The cause
+ * is struct iw_priv_args, which was not really designed for the
+ * job we are going here.
+ *
+ * IMPORTANT : This function prevent to set and get data on the same
+ * IOCTL and enforce the SET/GET convention. Not doing it would be
+ * far too hairy...
+ * If you need to set and get data at the same time, please don't use
+ * a iw_handler but process it in your ioctl handler (i.e. use the
+ * old driver API).
+ */
+static inline int rtnetlink_private_set(struct net_device *	dev,
+					struct iw_event *	request,
+					int			request_len,
+					iw_handler		handler)
+{
+	const struct iw_priv_args *	descr = NULL;
+	unsigned int			cmd;
+	union iwreq_data *		wrqu;
+	union iwreq_data		wrqu_point;
+	int				hdr_len;
+	char *				extra = NULL;
+	int				extra_size = 0;
+	int				offset = 0;	/* For sub-ioctls */
+	struct iw_request_info		info;
+	int				i;
+	int				ret = -EINVAL;
+
+	/* Get the description of the Request */
+	cmd = request->cmd;
+	for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
+		if(cmd == dev->wireless_handlers->private_args[i].cmd) {
+			descr = &(dev->wireless_handlers->private_args[i]);
+			break;
+		}
+	if(descr == NULL)
+		return -EOPNOTSUPP;
+
+#ifdef WE_RTNETLINK_DEBUG
+	printk(KERN_DEBUG "%s (WE.r) : Found private handler for 0x%04X\n",
+	       ifr->ifr_name, cmd);
+	printk(KERN_DEBUG "%s (WE.r) : Name %s, set %X, get %X\n",
+	       dev->name, descr->name, descr->set_args, descr->get_args);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+	/* Compute the size of the set arguments */
+	/* Check for sub-ioctl handler */
+	if(descr->name[0] == '\0')
+		/* Reserve one int for sub-ioctl index */
+		offset = sizeof(__u32);
+
+	/* Size of set arguments */
+	extra_size = get_priv_size(descr->set_args);
+
+	/* Does it fits in wrqu ? */
+	if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
+	   (extra_size <= IFNAMSIZ)) {
+		hdr_len = IW_EV_LCP_LEN + extra_size;
+		extra_size = 0;
+	} else {
+		hdr_len = IW_EV_POINT_LEN;
+	}
+
+	/* Extract fixed header from request. This is properly aligned. */
+	wrqu = &request->u;
+
+	/* Check if wrqu is complete */
+	if(request_len < hdr_len) {
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG
+		       "%s (WE.r) : Wireless request too short (%d)\n",
+		       dev->name, request_len);
+#endif	/* WE_RTNETLINK_DEBUG */
+		return -EINVAL;
+	}
+
+	/* Prepare the call */
+	info.cmd = cmd;
+	info.flags = 0;
+
+	/* Check if we have a pointer to user space data or not. */
+	if(extra_size == 0) {
+
+		/* No extra arguments. Trivial to handle */
+		ret = handler(dev, &info, wrqu, (char *) wrqu);
+
+	} else {
+		int	extra_len;
+
+		/* Put wrqu in the right place (skip pointer) */
+		memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
+		       wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN);
+
+		/* Does it fits within bounds ? */
+		if(wrqu_point.data.length > (descr->set_args &
+					     IW_PRIV_SIZE_MASK))
+			return -E2BIG;
+
+		/* Real length of payload */
+		extra_len = adjust_priv_size(descr->set_args, &wrqu_point);
+
+		/* Check if request is self consistent */
+		if((request_len - hdr_len) < extra_len) {
+#ifdef WE_RTNETLINK_DEBUG
+			printk(KERN_DEBUG "%s (WE.r) : Wireless request data too short (%d)\n",
+			       dev->name, extra_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+			return -EINVAL;
+		}
+
+#ifdef WE_RTNETLINK_DEBUG
+		printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes\n",
+		       dev->name, extra_size);
+#endif	/* WE_RTNETLINK_DEBUG */
+
+		/* Always allocate for max space. Easier, and won't last
+		 * long... */
+		extra = kmalloc(extra_size, GFP_KERNEL);
+		if (extra == NULL)
+			return -ENOMEM;
+
+		/* Copy extra in aligned buffer */
+		memcpy(extra, ((char *) request) + hdr_len, extra_len);
+
+		/* Call the handler */
+		ret = handler(dev, &info, &wrqu_point, extra);
+
+		/* Cleanup - I told you it wasn't that long ;-) */
+		kfree(extra);
+	}
+
+	/* Call commit handler if needed and defined */
+	if(ret == -EIWCOMMIT)
+		ret = call_commit_handler(dev);
+
+	return ret;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Main RtNetlink dispatcher. Called from the main networking code
+ * (do_getlink() in net/core/rtnetlink.c).
+ * Check the type of Request and call the appropriate wrapper...
+ */
+int wireless_rtnetlink_get(struct net_device *	dev,
+			   char *		data,
+			   int			len,
+			   char **		p_buf,
+			   int *		p_len)
+{
+	struct iw_event *	request = (struct iw_event *) data;
+	iw_handler		handler;
+
+	/* Check length */
+	if(len < IW_EV_LCP_LEN) {
+		printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n",
+		       dev->name, len);
+		return -EINVAL;
+	}
+
+	/* ReCheck length (len may have padding) */
+	if(request->len > len) {
+		printk(KERN_DEBUG "%s (WE.r) : RtNetlink request len invalid (%d-%d)\n",
+		       dev->name, request->len, len);
+		return -EINVAL;
+	}
+
+	/* Only accept GET requests in here */
+	if(!IW_IS_GET(request->cmd))
+		return -EOPNOTSUPP;
+
+	/* Special cases */
+	if(request->cmd == SIOCGIWSTATS)
+		/* Get Wireless Stats */
+		return rtnetlink_standard_get(dev,
+					      request,
+					      request->len,
+					      &iw_handler_get_iwstats,
+					      p_buf, p_len);
+	if(request->cmd == SIOCGIWPRIV) {
+		/* Check if we have some wireless handlers defined */
+		if(dev->wireless_handlers == NULL)
+			return -EOPNOTSUPP;
+		/* Get Wireless Stats */
+		return rtnetlink_standard_get(dev,
+					      request,
+					      request->len,
+					      &iw_handler_get_private,
+					      p_buf, p_len);
+	}
+
+	/* Basic check */
+	if (!netif_device_present(dev))
+		return -ENODEV;
+
+	/* Try to find the handler */
+	handler = get_handler(dev, request->cmd);
+	if(handler != NULL) {
+		/* Standard and private are not the same */
+		if(request->cmd < SIOCIWFIRSTPRIV)
+			return rtnetlink_standard_get(dev,
+						      request,
+						      request->len,
+						      handler,
+						      p_buf, p_len);
+		else
+			return rtnetlink_private_get(dev,
+						     request,
+						     request->len,
+						     handler,
+						     p_buf, p_len);
+	}
+
+	return -EOPNOTSUPP;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Main RtNetlink dispatcher. Called from the main networking code
+ * (do_setlink() in net/core/rtnetlink.c).
+ * Check the type of Request and call the appropriate wrapper...
+ */
+int wireless_rtnetlink_set(struct net_device *	dev,
+			   char *		data,
+			   int			len)
+{
+	struct iw_event *	request = (struct iw_event *) data;
+	iw_handler		handler;
+
+	/* Check length */
+	if(len < IW_EV_LCP_LEN) {
+		printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n",
+		       dev->name, len);
+		return -EINVAL;
+	}
+
+	/* ReCheck length (len may have padding) */
+	if(request->len > len) {
+		printk(KERN_DEBUG "%s (WE.r) : RtNetlink request len invalid (%d-%d)\n",
+		       dev->name, request->len, len);
+		return -EINVAL;
+	}
+
+	/* Only accept SET requests in here */
+	if(!IW_IS_SET(request->cmd))
+		return -EOPNOTSUPP;
+
+	/* Basic check */
+	if (!netif_device_present(dev))
+		return -ENODEV;
+
+	/* New driver API : try to find the handler */
+	handler = get_handler(dev, request->cmd);
+	if(handler != NULL) {
+		/* Standard and private are not the same */
+		if(request->cmd < SIOCIWFIRSTPRIV)
+			return rtnetlink_standard_set(dev,
+						      request,
+						      request->len,
+						      handler);
+		else
+			return rtnetlink_private_set(dev,
+						     request,
+						     request->len,
+						     handler);
+	}
+
+	return -EOPNOTSUPP;
+}
+#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
+
+
 /************************* EVENT PROCESSING *************************/
 /*
  * Process events generated by the wireless layer or the driver.
  * Most often, the event will be propagated through rtnetlink
  */
 
-#ifdef WE_EVENT_NETLINK
-/* "rtnl" is defined in net/core/rtnetlink.c, but we need it here.
- * It is declared in <linux/rtnetlink.h> */
-
+#ifdef WE_EVENT_RTNETLINK
 /* ---------------------------------------------------------------- */
 /*
  * Fill a rtnetlink message with our event data.
@@ -1121,12 +1857,11 @@ static inline int rtnetlink_fill_iwinfo(struct sk_buff *	skb,
 	r->__ifi_pad = 0;
 	r->ifi_type = dev->type;
 	r->ifi_index = dev->ifindex;
-	r->ifi_flags = dev->flags;
+	r->ifi_flags = dev_get_flags(dev);
 	r->ifi_change = 0;	/* Wireless changes don't affect those flags */
 
 	/* Add the wireless events in the netlink packet */
-	RTA_PUT(skb, IFLA_WIRELESS,
-		event_len, event);
+	RTA_PUT(skb, IFLA_WIRELESS, event_len, event);
 
 	nlh->nlmsg_len = skb->tail - b;
 	return skb->len;
@@ -1163,7 +1898,7 @@ static inline void rtmsg_iwinfo(struct net_device *	dev,
 	NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 	netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
 }
-#endif	/* WE_EVENT_NETLINK */
+#endif	/* WE_EVENT_RTNETLINK */
 
 /* ---------------------------------------------------------------- */
 /*
@@ -1255,10 +1990,10 @@ void wireless_send_event(struct net_device *	dev,
 	if(extra != NULL)
 		memcpy(((char *) event) + hdr_len, extra, extra_len);
 
-#ifdef WE_EVENT_NETLINK
-	/* rtnetlink event channel */
+#ifdef WE_EVENT_RTNETLINK
+	/* Send via the RtNetlink event channel */
 	rtmsg_iwinfo(dev, (char *) event, event_len);
-#endif	/* WE_EVENT_NETLINK */
+#endif	/* WE_EVENT_RTNETLINK */
 
 	/* Cleanup */
 	kfree(event);