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wext: Extract private call iw_point handling into seperate functions.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-12-21 03:33:46 -08:00 committed by David S. Miller
parent 84149b0fca
commit d88174e4d2
1 changed files with 75 additions and 68 deletions
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143
net/wireless/wext.c
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@ -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 * a iw_handler but process it in your ioctl handler (i.e. use the
* old driver API). * old driver API).
*/ */
static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr, static int get_priv_descr_and_size(struct net_device *dev, unsigned int cmd,
unsigned int cmd, iw_handler handler) const struct iw_priv_args **descrp)
{ {
struct iwreq * iwr = (struct iwreq *) ifr; const struct iw_priv_args *descr;
const struct iw_priv_args * descr = NULL; int i, extra_size;
struct iw_request_info info;
int extra_size = 0;
int i;
int ret = -EINVAL;
/* Get the description of the IOCTL */ descr = NULL;
for (i = 0; i < dev->wireless_handlers->num_private_args; i++) for (i = 0; i < dev->wireless_handlers->num_private_args; i++) {
if (cmd == dev->wireless_handlers->private_args[i].cmd) { if (cmd == dev->wireless_handlers->private_args[i].cmd) {
descr = &(dev->wireless_handlers->private_args[i]); descr = &dev->wireless_handlers->private_args[i];
break; break;
} }
}
/* Compute the size of the set/get arguments */ extra_size = 0;
if (descr != NULL) { if (descr) {
if (IW_IS_SET(cmd)) { if (IW_IS_SET(cmd)) {
int offset = 0; /* For sub-ioctls */ int offset = 0; /* For sub-ioctls */
/* Check for sub-ioctl handler */ /* Check for sub-ioctl handler */
@ -933,6 +930,69 @@ static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
extra_size = 0; extra_size = 0;
} }
} }
*descrp = descr;
return extra_size;
}
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 what user space is giving us */
if (IW_IS_SET(cmd)) {
if (!iwp->pointer && iwp->length != 0)
return -EFAULT;
if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK))
return -E2BIG;
} else if (!iwp->pointer)
return -EFAULT;
extra = kmalloc(extra_size, GFP_KERNEL);
if (!extra)
return -ENOMEM;
/* 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 */
err = handler(dev, info, (union iwreq_data *) iwp, extra);
/* 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);
if (copy_to_user(iwp->pointer, extra, extra_size))
err = -EFAULT;
}
out:
kfree(extra);
return err;
}
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 */ /* Prepare the call */
info.cmd = cmd; info.cmd = cmd;
@ -943,63 +1003,10 @@ static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
/* No extra arguments. Trivial to handle */ /* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u)); ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
} else { } else {
char * extra; ret = ioctl_private_iw_point(&iwr->u.data, cmd, descr,
int err; handler, dev, &info, extra_size);
/* 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;
/* 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;
/* 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;
}
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
/* If we have something to return to the user */
if (!ret && 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,
&(iwr->u.data));
}
err = copy_to_user(iwr->u.data.pointer, extra,
extra_size);
if (err)
ret = -EFAULT;
}
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
} }
/* Call commit handler if needed and defined */ /* Call commit handler if needed and defined */
if (ret == -EIWCOMMIT) if (ret == -EIWCOMMIT)
ret = call_commit_handler(dev); ret = call_commit_handler(dev);