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Message-Id: <20080617.005335.215313571.davem@davemloft.net>
Date: Tue, 17 Jun 2008 00:53:35 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: linville@...driver.com
CC: mokuno@...sony.co.jp, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/12]: wext: Extract private call iw_point handling into
seperate functions.
wext: Extract private call iw_point handling into seperate functions.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
net/wireless/wext.c | 141 +++++++++++++++++++++++++++------------------------
1 files changed, 74 insertions(+), 67 deletions(-)
diff --git a/net/wireless/wext.c b/net/wireless/wext.c
index d17c0f4..a1cd19a 100644
--- a/net/wireless/wext.c
+++ b/net/wireless/wext.c
@@ -890,25 +890,22 @@ static int ioctl_standard_call(struct net_device * dev,
* a iw_handler but process it in your ioctl handler (i.e. use the
* old driver API).
*/
-static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
- unsigned int cmd, iw_handler handler)
+static int get_priv_descr_and_size(struct net_device *dev, unsigned int cmd,
+ const struct iw_priv_args **descrp)
{
- struct iwreq * iwr = (struct iwreq *) ifr;
- const struct iw_priv_args * descr = NULL;
- struct iw_request_info info;
- int extra_size = 0;
- int i;
- int ret = -EINVAL;
+ const struct iw_priv_args *descr;
+ int i, extra_size;
- /* Get the description of the IOCTL */
- for (i = 0; i < dev->wireless_handlers->num_private_args; i++)
+ descr = NULL;
+ 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]);
+ descr = &dev->wireless_handlers->private_args[i];
break;
}
+ }
- /* Compute the size of the set/get arguments */
- if (descr != NULL) {
+ extra_size = 0;
+ if (descr) {
if (IW_IS_SET(cmd)) {
int offset = 0; /* For sub-ioctls */
/* Check for sub-ioctl handler */
@@ -933,72 +930,82 @@ static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
extra_size = 0;
}
}
+ *descrp = descr;
+ return extra_size;
+}
- /* Prepare the call */
- info.cmd = cmd;
- info.flags = 0;
+static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd,
+ const struct iw_priv_args *descr,
+ iw_handler handler, struct net_device *dev,
+ struct iw_request_info *info, int extra_size)
+{
+ char *extra;
+ int err;
- /* 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, &(iwr->u), (char *) &(iwr->u));
- } else {
- char * extra;
- int err;
+ /* Check what user space is giving us */
+ if (IW_IS_SET(cmd)) {
+ if (!iwp->pointer && iwp->length != 0)
+ return -EFAULT;
- /* Check what user space is giving us */
- if (IW_IS_SET(cmd)) {
- /* Check NULL pointer */
- if ((iwr->u.data.pointer == NULL) &&
- (iwr->u.data.length != 0))
- return -EFAULT;
+ if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK))
+ return -E2BIG;
+ } else if (!iwp->pointer)
+ return -EFAULT;
- /* Does it fits within bounds ? */
- if (iwr->u.data.length > (descr->set_args &
- IW_PRIV_SIZE_MASK))
- return -E2BIG;
- } else if (iwr->u.data.pointer == NULL)
- return -EFAULT;
+ extra = kmalloc(extra_size, GFP_KERNEL);
+ if (!extra)
+ return -ENOMEM;
- /* Always allocate for max space. Easier, and won't last
- * long... */
- extra = kmalloc(extra_size, GFP_KERNEL);
- if (extra == NULL)
- return -ENOMEM;
-
- /* If it is a SET, get all the extra data in here */
- if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
- err = copy_from_user(extra, iwr->u.data.pointer,
- extra_size);
- if (err) {
- kfree(extra);
- return -EFAULT;
- }
+ /* If it is a SET, get all the extra data in here */
+ if (IW_IS_SET(cmd) && (iwp->length != 0)) {
+ if (copy_from_user(extra, iwp->pointer, extra_size)) {
+ err = -EFAULT;
+ goto out;
}
+ }
- /* Call the handler */
- ret = handler(dev, &info, &(iwr->u), extra);
+ /* Call the handler */
+ err = handler(dev, info, (union iwreq_data *) iwp, extra);
- /* If we have something to return to the user */
- if (!ret && IW_IS_GET(cmd)) {
+ /* If we have something to return to the user */
+ if (!err && IW_IS_GET(cmd)) {
+ /* 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, iwp);
- /* 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,
- &(iwr->u.data));
- }
+ if (copy_to_user(iwp->pointer, extra, extra_size))
+ err = -EFAULT;
+ }
- err = copy_to_user(iwr->u.data.pointer, extra,
- extra_size);
- if (err)
- ret = -EFAULT;
- }
+out:
+ kfree(extra);
+ return err;
+}
- /* Cleanup - I told you it wasn't that long ;-) */
- kfree(extra);
- }
+static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
+ unsigned int cmd, iw_handler handler)
+{
+ struct iwreq *iwr = (struct iwreq *) ifr;
+ int extra_size = 0, ret = -EINVAL;
+ const struct iw_priv_args *descr;
+ struct iw_request_info info;
+ extra_size = get_priv_descr_and_size(dev, cmd, &descr);
+
+ /* 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, &(iwr->u), (char *) &(iwr->u));
+ } else {
+ ret = ioctl_private_iw_point(&iwr->u.data, cmd, descr,
+ handler, dev, &info, extra_size);
+ }
/* Call commit handler if needed and defined */
if (ret == -EIWCOMMIT)
--
1.5.5.1.308.g1fbb5
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