[PATCH] WE-19 for kernel 2.6.13

	Hi Jeff,

	This is version 19 of the Wireless Extensions. It was supposed
to be the fallback of the WPA API changes, but people seem quite happy
about it (especially Jouni), so the patch is rather small.
	The patch has been fully tested with 2.6.13 and various
wireless drivers, and is in its final version. Would you mind pushing
that into Linus's kernel so that the driver and the apps can take
advantage ot it ?

	It includes :
	o iwstat improvement (explicit dBm). This is the result of
long discussions with Dan Williams, the authors of
NetworkManager. Thanks to him for all the fruitful feedback.
	o remove pointer from event stream. I was not totally sure if
this pointer was 32-64 bits clean, so I'd rather remove it and be at
peace with it.
	o remove linux header from wireless.h. This has long been
requested by people writting user space apps, now it's done, and it
was not even painful.
	o final deprecation of spy_offset. You did not like it, it's
now gone for good.
	o Start deprecating dev->get_wireless_stats -> debloat netdev
	o Add "check" version of event macros for ieee802.11
stack. Jiri Benc doesn't like the current macros, we aim to please ;-)
	All those changes, except the last one, have been bit-roting on
my web pages for a while...

	Patches for most kernel drivers will follow. Patches for the
Orinoco and the HostAP drivers have been sent to their respective
maintainers.

	Have fun...

	Jean
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 108 insertions, 15 deletions

diff --git a/include/net/iw_handler.h b/include/net/iw_handler.h
index 44edd48f1234..d67c8393a343 100644
--- a/include/net/iw_handler.h
+++ b/include/net/iw_handler.h
@@ -1,10 +1,10 @@
 /*
  * This file define the new driver API for Wireless Extensions
  *
- * Version :    6       21.6.04
+ * Version :    7       18.3.05
  *
  * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
- * Copyright (c) 2001-2004 Jean Tourrilhes, All Rights Reserved.
+ * Copyright (c) 2001-2005 Jean Tourrilhes, All Rights Reserved.
  */
 
 #ifndef _IW_HANDLER_H
@@ -207,7 +207,7 @@
  * will be needed...
  * I just plan to increment with each new version.
  */
-#define IW_HANDLER_VERSION      6
+#define IW_HANDLER_VERSION      7
 
 /*
  * Changes :
@@ -232,6 +232,13 @@
  *      - Remove spy #ifdef, they are always on -> cleaner code
  *      - Add IW_DESCR_FLAG_NOMAX flag for very large requests
  *      - Start migrating get_wireless_stats to struct iw_handler_def
+ *
+ * V6 to V7
+ * --------
+ *      - Add struct ieee80211_device pointer in struct iw_public_data
+ *      - Remove (struct iw_point *)->pointer from events and streams
+ *      - Remove spy_offset from struct iw_handler_def
+ *      - Add "check" version of event macros for ieee802.11 stack
  */
 
 /**************************** CONSTANTS ****************************/
@@ -334,9 +341,6 @@ struct iw_handler_def
          * We will automatically export that to user space... */
         const struct iw_priv_args *     private_args;
 
-        /* This field will be *removed* in the next version of WE */
-        long                    spy_offset;     /* DO NOT USE */
-
         /* New location of get_wireless_stats, to de-bloat struct net_device.
          * The old pointer in struct net_device will be gradually phased
          * out, and drivers are encouraged to use this one... */
@@ -400,16 +404,21 @@ struct iw_spy_data
 /* --------------------- DEVICE WIRELESS DATA --------------------- */
 /*
  * This is all the wireless data specific to a device instance that
- * is managed by the core of Wireless Extensions.
+ * is managed by the core of Wireless Extensions or the 802.11 layer.
  * We only keep pointer to those structures, so that a driver is free
  * to share them between instances.
  * This structure should be initialised before registering the device.
  * Access to this data follow the same rules as any other struct net_device
  * data (i.e. valid as long as struct net_device exist, same locking rules).
  */
+/* Forward declaration */
+struct ieee80211_device;
+/* The struct */
 struct iw_public_data {
         /* Driver enhanced spy support */
-        struct iw_spy_data *    spy_data;
+        struct iw_spy_data *            spy_data;
+        /* Structure managed by the in-kernel IEEE 802.11 layer */
+        struct ieee80211_device *       ieee80211;
 };
 
 /**************************** PROTOTYPES ****************************/
@@ -424,7 +433,7 @@ struct iw_public_data {
 extern int dev_get_wireless_info(char * buffer, char **start, off_t offset,
                                  int length);
 
-/* Handle IOCTLs, called in net/code/dev.c */
+/* Handle IOCTLs, called in net/core/dev.c */
 extern int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd);
 
 /* Second : functions that may be called by driver modules */
@@ -479,7 +488,7 @@ iwe_stream_add_event(char *	stream,		/* Stream of events */
                      int        event_len)      /* Real size of payload */
 {
         /* Check if it's possible */
-        if((stream + event_len) < ends) {
+        if(likely((stream + event_len) < ends)) {
                 iwe->len = event_len;
                 memcpy(stream, (char *) iwe, event_len);
                 stream += event_len;
@@ -495,14 +504,17 @@ iwe_stream_add_event(char *	stream,		/* Stream of events */
 static inline char *
 iwe_stream_add_point(char *     stream,         /* Stream of events */
                      char *     ends,           /* End of stream */
-                     struct iw_event *iwe,      /* Payload */
-                     char *     extra)
+                     struct iw_event *iwe,      /* Payload length + flags */
+                     char *     extra)          /* More payload */
 {
         int     event_len = IW_EV_POINT_LEN + iwe->u.data.length;
         /* Check if it's possible */
-        if((stream + event_len) < ends) {
+        if(likely((stream + event_len) < ends)) {
                 iwe->len = event_len;
-                memcpy(stream, (char *) iwe, IW_EV_POINT_LEN);
+                memcpy(stream, (char *) iwe, IW_EV_LCP_LEN);
+                memcpy(stream + IW_EV_LCP_LEN,
+                       ((char *) iwe) + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
+                       IW_EV_POINT_LEN - IW_EV_LCP_LEN);
                 memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length);
                 stream += event_len;
         }
@@ -526,7 +538,7 @@ iwe_stream_add_value(char *	event,		/* Event in the stream */
         event_len -= IW_EV_LCP_LEN;
 
         /* Check if it's possible */
-        if((value + event_len) < ends) {
+        if(likely((value + event_len) < ends)) {
                 /* Add new value */
                 memcpy(value, (char *) iwe + IW_EV_LCP_LEN, event_len);
                 value += event_len;
@@ -537,4 +549,85 @@ iwe_stream_add_value(char *	event,		/* Event in the stream */
         return value;
 }
 
+/*------------------------------------------------------------------*/
+/*
+ * Wrapper to add an Wireless Event to a stream of events.
+ * Same as above, with explicit error check...
+ */
+static inline char *
+iwe_stream_check_add_event(char *       stream,         /* Stream of events */
+                           char *       ends,           /* End of stream */
+                           struct iw_event *iwe,        /* Payload */
+                           int          event_len,      /* Size of payload */
+                           int *        perr)           /* Error report */
+{
+        /* Check if it's possible, set error if not */
+        if(likely((stream + event_len) < ends)) {
+                iwe->len = event_len;
+                memcpy(stream, (char *) iwe, event_len);
+                stream += event_len;
+        } else
+                *perr = -E2BIG;
+        return stream;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Wrapper to add an short Wireless Event containing a pointer to a
+ * stream of events.
+ * Same as above, with explicit error check...
+ */
+static inline char *
+iwe_stream_check_add_point(char *       stream,         /* Stream of events */
+                           char *       ends,           /* End of stream */
+                           struct iw_event *iwe,        /* Payload length + flags */
+                           char *       extra,          /* More payload */
+                           int *        perr)           /* Error report */
+{
+        int     event_len = IW_EV_POINT_LEN + iwe->u.data.length;
+        /* Check if it's possible */
+        if(likely((stream + event_len) < ends)) {
+                iwe->len = event_len;
+                memcpy(stream, (char *) iwe, IW_EV_LCP_LEN);
+                memcpy(stream + IW_EV_LCP_LEN,
+                       ((char *) iwe) + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
+                       IW_EV_POINT_LEN - IW_EV_LCP_LEN);
+                memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length);
+                stream += event_len;
+        } else
+                *perr = -E2BIG;
+        return stream;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Wrapper to add a value to a Wireless Event in a stream of events.
+ * Be careful, this one is tricky to use properly :
+ * At the first run, you need to have (value = event + IW_EV_LCP_LEN).
+ * Same as above, with explicit error check...
+ */
+static inline char *
+iwe_stream_check_add_value(char *       event,          /* Event in the stream */
+                           char *       value,          /* Value in event */
+                           char *       ends,           /* End of stream */
+                           struct iw_event *iwe,        /* Payload */
+                           int          event_len,      /* Size of payload */
+                           int *        perr)           /* Error report */
+{
+        /* Don't duplicate LCP */
+        event_len -= IW_EV_LCP_LEN;
+
+        /* Check if it's possible */
+        if(likely((value + event_len) < ends)) {
+                /* Add new value */
+                memcpy(value, (char *) iwe + IW_EV_LCP_LEN, event_len);
+                value += event_len;
+                /* Patch LCP */
+                iwe->len = value - event;
+                memcpy(event, (char *) iwe, IW_EV_LCP_LEN);
+        } else
+                *perr = -E2BIG;
+        return value;
+}
+
 #endif  /* _IW_HANDLER_H */